The biggest thing steemit, and actually any social media site, is that there is no search tool. Posts get old, then they just disappear.
But, this is a subject for an innovative programmer to work on, and won't be helped much buy 300,000 SP. I probably should work on it, but I still haven't gotten anywhere with communicating to the programmers of steemit. If you don't have that connection first, you could write the greatest (new post page, search engine, post sorting...) and it will just sit on github collecting dust.
Anyway, you wanted thoughts on the SP. I suggest finding one or two great posts per day and put them firmly on the trending page. You really can't do more. (time-wise, and space on the trending page-wise)
It is great that you work with the people who respond to your posts, and that is probably the best use of your SP.
After that, just spread around any extra voting power you have by going through the New-tab and voting just on title.
We do indeed need a more effective searching mechanism. Perhaps that will be a part of communities?
It will not be part of communities. (they aren't even talking about search)
But, as long as communities are not too small (that they die of boredom) and not too large, then finding things inside one will be much easier than without the community.