You're on track - despite having little to no experience in your target industry, you already have quite a few customers and a functioning prototype or MVP.
It's still important to continue learning from customers, but at this point you've reached a coveted position - you've very likely found product market fit. Congratulations!
Your next steps are to take this initial product-market fit and transform your early version into a scalable solution - fast.
Sit down and make an honest assessment of what you can really do with the resources you have right now. What type of product could you actually build? How much support can you actually provide?
Make sure what your customers can expect from you now vs later is clear. For the customers you can't serve right now, let them know when you think you could help them, and proactively communicate about your progress and roadmap to keep them engaged.
You need to build a product fast. Luckily, there are a lot of low code and no-code solutions that can help you automate simple tasks (like Zapier) and create an minimum viable product in hours or days rather than months. Check out toolmeup.io for a comparison to find the right tool for you.
Are these the best/cheapest options at scale? No. Will they help you grow and learn quickly? Absolutely.
Many people start this step too soon - but you're at the perfect moment. Invest in the technical talent now that can create a scalable product architecture for the future. This includes best practices like strong processes, keeping documentation, clear roles, and a team that can grow and absorb new talent in the future.
If your business keeps growing, you will need to take this step at some point. The longer you wait, the more painful the transition and growing pains will be.