It's Quite difficult to find some good bounties but possible if you research well. Below some tips for you

Automated Bounty Platforms.
1. https://bountyhive.io/
2. https://beta.bounty0x.io/bounties
3. https://bountyhunters.io/
4. https://bountyplatform.io/
5. https://bountysuite.com/

These sites are helpful to find some good bounties.
1. https://icobench.com/icos/bounty?filterSort=started-asc
2. https://icorating.com/
3. https://icobazaar.com/
4. https://icomarks.com/
There are many ICO ranking sites & most rated projects with most number of rating sites can be found with cross checking in these sites. Do those bounties.

This is called Top 7 ICO & they collect all ICO ratings by experts. The spreadsheet is in their telegram & twitter. Dig in to this spread sheet & do the allowed bounties. This is one of the best ways to identify the best bounties at a one click & spread this word to fellow bounty hunters as well.

- https://twitter.com/top7ico?lang=en
- t.me/top7ico  

There can be some other ways to find a good bounty. Many rating sites are there but carefully select sites which are trusted & doing expert ratings as we can't believe all the rating sites. Do your own research & do hard work to succeed as a bounty hunter. Best of luck.