I invested in a startup, what to do next?

Here's context. I've never invested in anything much more than small donations to causes I support and a few hundreds in crytocurrency. I'm an engineer working in a startup myself. I've been living a very frugal life and I felt I needed to invest in people who are working on something I believe in. That's why I've just spent half my savings as a seed fund on an early-stage, hard-tech startup. I want to stay committed to the company and help out with whatever I can, but I don't know how. As an inexperienced (and most would say reckless) investor, I'd like to know what to do next. Hoping to get some advices from experienced people.