If you want to receive more rewards in bounty campaigns, there is only one way. That is, to develop your skills. If you are a good coder or programmer, or if you are expert in creating videos, you will make massive income. You will even get paid in whatever coin you prefer. That is the best way to receive more reward.

But the more important question at this point is, how sure are you that the bounty campaign you are joining will pay? You need to learn to make sure that whatever campaign you are joining is legit and will pay.