I’m a programmer, I deal with python in the foreground, I partially know Csharp and I know web programming. What could I offer as a gig you have my clients? With a good chance of making money?
Well, knowing what services to offer to which potential clients is a core part of your business and I don’t think you should outsource it.
To use Fiverr as an example you can search, as if you were buying, to see what other sellers are offering that fits into your skills and that should give you an idea, but the legwork should be yours.