[zeuch]

I ran multiple side projects in the past years, including SaaS. In my opinion you should stop when you're not happy with it anymore and also not excited enough to continue building it until you're happy with it again.

But don't give up easily! Don't expect you should grow as fast as the popular startups you've mentioned. You can allow yourself to grow slow and steady and still be extremely successful. Growing fast is what investors want, not necessarily what your customers want. Focus on working for your customers, not your investors (or potential investors).

If you're delivering value for those 8 customers, get closer to them, get into their shoes and then find more customers just like them (maybe they can even help you with that).

Then automate your operations as much as possible, and focus on getting your SaaS really stable for them. Then, slowly, deliver the most critical and important features for those customers, always focusing in high standards for quality and security.

Be a strong business, even if a small one. Run your business in a profit first approach. You might grow slow, but you grow healthy and strong this way, and if you persist, you may eventually find yourself grow really fast later.