Best way to join a startup on ProductHunt as a CoFounder?

I run a successful marketing agency but now I want to dive deep into startups. The goal is to build a startup that works on something innovative and solves a real problem. I have time and financial resources but I don't have a startup idea I'm in love with. I also don't have a CoFounder. My idea is to find a product on ProductHunt that has some sales but not a lot of traction + only 1-2 technical founders running it. Then we could work together with them on a mini-project and at some point, I can join as a CoFounder. Question: Should I just check the new launches every day and reach out to the teams I like? Or is there a better way to go about it (since some products already have big enough teams)? I'm mainly looking for solo technical founders who need help with marketing, business, etc.