A full stack developer needs some suggestions.

Hello BHW members,
As the title suggests I am a full stack developer and very comfortable with servers, DB designs, backend . Android and IOS(still working on my IOS skills)
Right now I work for a few of my clients and some freelance work once in a while and it's going great.
But now I want to develop something under my own brand and name, I have some ideas and I can execute them but problem is I have no experience in marketing, ASO, SEO etc.
I do know the core concepts for ASO and SEO but…

A full stack developer needs some suggestions.