yo bro, always remember the hardest part about building a SaaS isn't ever the code, the really hard thing is finding some common problem in the market to build your SaaS as a solution for it, it's all business and you have to provide solutions, these solutions in ur case will be applications but in business it's just solutions, and if u don't slove any real world problem with your application or u don't know how to market it it won't work, SaaS is a business and the hardest thing isn't the code, it is how to do business