That's a very good question, and it's pretty universal. We all hit that STEEM wall at some point, and maybe more than once. The problem is, there's quite a few things combining against us when it comes to getting eyes on posts, and most of them are out of our control. Knowing all that might help, or it might have the opposite effect and make things worse. For me, knowing what I can control and what I can't is most of the battle, so I'll walk through some of the issues first on the way to potential solutions.
This is probably the main issue. Getting seen. Some on STEEM will insist that they're flat out being ignored. I don't believe it's so intentional as that, but the result is more or less the same. Fewer eyes translates to fewer comments and fewer upvotes.
To get around this, some people self-upvote, buy votes from bidbots, lease or otherwise get delegation so they can at least increase their curation rewards, and some just plain give up, go looking for greener pastures, etc.
Curation is based on upvotes. Currently curators are supposed to get 25% back from whatever amounts they allocate to a post, but that's not always the case. Sometimes it's more, and I believe it can be less, depending on how many people curate the same content, how much they upvote, what voting weight they put to it, and when they upvoted. That's a lot to keep track of.
People seem to think they should all upvote the most popular posts, based on the $ amount under the post, when really, that might not be the best. Not all curators are going to win that game.
So, for some people, it's more about the ROI (return on investment) than it is about the content. Autovoting, curation trails, etc., all take eyes, and thus interaction, off of posts.
WHAT TO DO
Well, the first thing to remember is, for most of us, an audience doesn't come built in. All those now famous bloggers and YouTubers? It took a minimum of two years, for the most part, to get them there, and in some cases, up to five years. That means a couple of things were necessary in the interim:
Which is the last thing we want to have, or the last thing we feel we can have. Time isn't often a luxury we can afford. But really, unless you're a celebrity with a ready bunch of followers that you can take with you wherever you go, it's going to take time be seen. Period.
That means posting, even when you're not feeling motivated to do so. Which also means fighting through it on some days. It can also mean avoiding over posting, until your audience is building up. Otherwise, posts are just going out to the void.
KNOWING WHAT PEOPLE READ
There's nothing like doing a little bit of market research, if it matters that much, to see what people like to read. It may not be what you like to write, but mixing in something like that on a fairly regular basis probably won't hurt. Most people want to talk about one or two things tops to build brand, and that's fine. But to do that, again, is going to take awhile. If you're getting eyes on some posts but not on others, it might be best to work on some more of the relatively succesful posts, or at least alter the ratio a bit.
BETTER NOW THAN LATER
Most of us are here to post to some degree. That means our posts are competing with everyone else's. And that's during a period of low activity, compared to where it was at the beginning of last year. It only gets worse when STEEM value goes up and more people get interested in earning rewards. That means now is the best time. Having a sense of that urgency can help motivation.
Usually demotivation occurs when one's expectations are higher than one's reality. The two need to come closer to alignment, at least enough to provide encouragement. If after six months, say, the expectation is to be far wider known than what's happening, that probably means that the goal is too big, the effort is too low, or some combination of the two. Knowing how that's breaking down will help.
It takes time and a lot of effort, more than we might have, or think we need. It just does.
COMMENTING AND CURATING
The best way I know to organically get readers, other than consistently posting to some degree content people want, is to go to them. That means visiting their own blogs, curating their posts and leaving comments. Their comment section can act as your calling card. If people see you taking time to curate them, there's bound to be some who will reciprocate. Especially if you share interests.
TIME SPENT CREATING POSTS
There's definitely a time spent versus rewards ratio that needs to be maintained. If you're spending too little time, people will probably not do much with your posts. If you're spending too much time, most people won't see the effort or time involved, just the end result. So, spending a lot of time on something that people may not see, let alone care about, is not a good way to stay motivated.
Spending enough time to churn something out someone will read is good enough. They shouldn't be junk posts, but they don't need to be masterpieces.
FIND YOUR WHY/RATIO
Knowing why you're here and what you hope to accomplish can help with motivation. If you're getting hung up on one aspect or another of STEEM, it might be time to take a step back and take a deep breath. Spend a little time a way.
Then, when you're back, look at that ratio of effort to reward, and find the place you feel most comfortable with. Over time, it can be adjusted to suit, but it needs to find equilibrium first, or expectations and reality will always be out of whack, which means motivation will suffer because of it.