A lot of bounties abound but not all are worth participating in. You can go by this criteria as it works for most people.

1. Always look out for bounties managed by people with previous history of successful bounties.
2. Always look out for the team behind the project. Check out for their credentials if they are truly what they present.
3. Get to know the advisor. Check the social media of the advisor to see if he really tweets or make posts about the project.
4. Read the whitepaper. Is the idea worth the interest of investors? What is the product? Is it something new to take crypto to a different level or is a repetition of same old idea of many projects?

I believe after coming across with answers to these queries, you will surely know what to do with such bounties.