Should I sell tokens right after I got it from campaign?
I have been participating in different airdrops for almost a year, and at least from what I have observed from my personal experience the best moments to sell most of the tokens is as soon as they are released to the market, because in an incomprehensible way for me, they tend to fall in price as time goes on and very few tokens have the capacity to recover their value and even reach considerable prices.
This is generally true. So, if you joined the ICO bounty with a view to make a quick profit, then obviously sell. In fact, you should probably sell anyway as you obtained your tokens through a bounty, for free (of money, but not time).
If you had a real interest in the project you may have opted to acquire tokens/ coins through the ICO (ideally at the earlier private stages). As you didn't go down this route then my comment above applies.