Use a monolith approach and a traditional framework to do it on in a boring language you're proficient with along with boring tools (Rails, Django, Laravel, etc). Solo dev is not what teams are optimized for. If you day job is microservices or front-end React components, all that stuff gets in the way when you're just trying to get something out the door. Most things don't need a front-end framework, keep machinery as simple as possible with the least amount of moving parts. Focus on features and shipping.