I don't have any bounty to propose (right now) but an idea could be: create a steemit forum where people upvote for ideas proposed in that forum, that way the best ideas, or most urgent or more needed, or the ones the community value more will naturally emerge to the top of the list... and then those could be prioritized as the ideal candidates as bounties.
One advantage of this is that a pattern could reveal itself for a set of priorities that could gain some traction if implemented at nearly the same time, instead of isolated ideas where that momentum is not achieved.
Does that forum exist? if not we could agree to creat a special hashtag (or tag) to hunt for those new proposed ideas. Or maybe if someone likes the idea, my proposed bounty (but I don't have anything to reward the labor other than my upvote LOL) would be someone would create that forum where the community brainstorm ideas openly and from there we will see which ideas are gaining some STEEM, homophone pun intended.
Take for example this post: https://steemit.com/steemit/@kyriacos/last-night-i-dreamt-about-steemit-10-suggestions-to-make-the-platform-grow
Each one of this 10 ideas could be a separate post in that forum (or with a special hashtag) where the community upvote the best ones, or simply the most urgent ideas right now.