Consider hiring a virtual personal assistant and delegating the low impact, high (time) cost tasks. There will be an inherent limit to how much money you can make if you try to do it alone.

If you truly want to learn to build a business, realize that you aren't a software developer anymore. You're a businessperson and thats completely different. It's a different field and you can have a lot of fun learning it. It's a reward experience.

I say this from experience. I grew my company from 2-3k MRR and did it all myself. It was only when I realized I needed to hire myself out of low level tasks and focus on the important things did I start to make real strides. It wasn't long before I was well beyond that MRR level (now have 6 employees)