You need a lot of effort to do when joining a Bounty.

Some bounty campaigns require Social Marketing campaigns like Facebook, Twitter, Youtube (Video Review) etc.

There are other things also that you can do, like if you're good in doing a translation, you can join this campaign by translating the ANN, whitepaper and etc. based on your native language.

And you can join a signature campaign also.

Lastly, "You must be active and read all the rules before joining a bounty"