I would suggest you to half-compete with agencies and make a turnover into a platform.

Since you are using a lot of the codebase that you’ve made before, I think the best solution is to present your service as a seemingly automated platform where clients can request an app/features/etc, and you’ll build it for a certain fee — even on a subscription basis.

I agree with @alvivanco on this — eventually this can become a “no-code” platform, but right now (kinda) it’ll be a service only. A similar approach can be found in Bravo Studio — no-code mobile app design-first development platform (basically, build an app in Figma). However, the owners also sell their own development services.

Also, as I’ve mentioned above, subscription model can become quite viable in this regard. Personally, I build an unlimited design/development subscription — clients can add their request via a simple form and see the progress in their dashboard. Unlimited requests per month — average request turnaround is about 3–5 days.

Hope my experience can be somehow helpful to you!