I've personally lost a lot of money on startups in the past and now, but I'm not giving up since it only takes one good business to recover what I've lost in the past and now.
So, for the time being, I'll keep investing, and what I've learnt is to check out launchpad. DAO creator is, in my opinion, one of the finest out there. One of their successful launches has been the Orion protocol.
I can understand you, I also had unsuccessful investments in young startups. But now everyone has joined the GameFi industry and many projects look quite attractive.