Sounds like you'd be better fit as a technical cofounder or first engineer hire. If you aren't thinking of ideas left and right to start, you likely aren't the business-y entrepreneur but that's perfectly fine. Ideas aren't what make a business/startup successful. It's all about the execution. YC's startup school (as others have mentioned) would probably be a great start and they do cofounder matching too.

Btw, seed & series A startups are still hyper risky. Seed is usually trying to figure out pmf (product market fit) and series A is trying to figure out marketing/CAC. These were distorted in the last few years too so just cus a startup raises a lot of money doesn't mean you can't compete and differentiate!

Last thing... If you're just trying to replace your bay area salary, that's a lifestyle business at best. You can literally mow lawns and be a multimillionaire these days.