My recommendation is to keep your post lengthy but not too much. Instead of 1 very lengthy post, make 2 a bit long ones, I'd rather see a more lengthy but meaningful post than multiple incomplete posts. then promote them with Minnowbooster as you're now whitelisted.

You can now use their service to promote your post. You can do that by sending your SBD to Minnowbooster with the link to your post as the memo. MB will then upvote you at around 2.6x the amount that you send. So a 10 SBD sent nets you $26 worth of upvote and 100 SBD gets 260.
If you do the math on the rewards assuming the STEEM price doesnt go down a 100 SBD boost sent to MB If we do the math You will get 96 SBD Back and 26 STEEM POWER!! ( I've already factored out the curation rewards ). This will not always be the case but in terms of SBD + STEEM you get in rewards it almost always results in profit for you.

The good thing about high voted posts is that more people get to see your post as they are reflected on the trending section meaning more exposure.

You can read more about them at steemit.com/@minnowbooster