I understand that age old wisdom is not start with money as sole motivator. However, I don't have a choice. Building SaaS is the only way out. Let's keep the backstory aside and not focus on it.
I have too many ideas and I have build a product partially. I got paid for doing manual work. I am afraid locking down on one idea is putting all eggs in one basket. If that does not work I will end up losing 6 months and some capital and opportunity cost.
How do I choose the product roadmap and what to build. I have been proficient in full-stack development, data engineering, and partly with ML/AI. No research experiece but that is not going to pay me anyway.
How do I build when there is SaaS overflow with AI app every day with Twitter bros advertising they made $10k in 3 months?
Customers are flooded with emails, ads, apps. What are ways you market your SaaS and make money?
Don't focus on tech stacks, don't focus on roadmaps and certainly don't focus on just consuming information passively on Twitter.
Heck, don't focus on HN.
Talk to people. Solve problems for them.
Look for problems with a high number of repeatable solutions.
If you find that, have a single customer pay you for building it for them, but retain IP.
Onboard customer 2, onboard customer 3, possibly with slight customizations.
Refine until you can onboard customers through self sign up.