Most of the campaigns are paying low rewards due to users increased and when rewards received the price of token/coin very low in exchanges, so you should join the good project after analysis of the project.
participating in a good project is the main goal.
But this is not a guarantee that in the future you will get great results, as you say that the number of participants in the campaign has greatly increased. Actually there is something that can be done so that participants get a lot of results by participating in good projects. If one campaign imposes a maximum number of participants. That is very influential.