Well, there are many options if you are looking for multiple bounty campaigns, the easiest and most visited are like @sunsilk says that is on the Bounties (Altcoins). If your choice, for example, likes to write, all you have to do is submit a registration in article campaign by making a POA, Btw. For content that makes you relevant, don't forget to read the contents of the project whitepaper that you are following, then you write and send your task to the Google form that has been prepared. But, if you want to enter another campaign for the same project, for example the previous signature campaign, read the rules first because there are special provisions regarding forum rank limits, if I'm not mistaken, the minimum is members and for newbies you can't.