You can't always grab every opportunities in the crypto space, some will be missed by choice and some will be missed by luck, if you don't believe in a project, your gains don't have to come from there, assuming you don't believe in meme coins and you believe in Layer 1 projects, you will still make some profits.
Luck also plays an important role in one's success in the crypto space. One of the closest and easiest to understand examples that happened in the bounty campaign, sometimes there are bounties that look promising but don't produce, there are also bounties that look mediocre but can give jackpots to their participants.
Doubts in a project arise after doing personal research, there is no need to beat yourself up for failing to hit the jackpot, everything is done based on the right decision at the time even though the end result is very different from what was previously predicted.