Ship fast, and ship often. You never know which project will become successful. So, to increase your odds, just launch often to validate them. Once something starts getting traction, focus on SEO and play a long game. This is what I would do if I could go back to my first startups.

Life time deal can be a nice way to get runaway cash. You can combine it with product hunt launch: https://www.lunadio.com/blog/we-... Linkedin outreach with Phantombuster is a good way to get early adopters & feedbacks.