Perhaps it would be helpful to articulate what you feel you are missing? (I'm presuming money, but I don't want to put words in your mouth.)
It sounds to me like you have a solid project, and some number of users. With good docs. Which is great (we'll done.)
I'm assuming you want to monetize it? That seems to be the logical next step. Alas I'm not going to be very comforting with the next bit.
A) the time to think about monetization is when you start the project, not when it's done. Obviously a lot of projects get done for reasons other than money, and when you started you may have had other reasons. That's fine. But monetizing after-the-fact is a very difficult, dare I say "unsolved" problem.
B) this is going to sting, but most successful money-earning products have nothing to do with the code, beyond that it exists. A "business" requires more than "product" - a lot more. Marketing, sales, revenue, administration and so on. All of this is expensive, hence the need to have a business plan (ie, how does this thing make money?) before you start.
As developers we have a code-first mindset. But we try and compete with companies that have a business-first mindset. Companies are winning.
The fact that your project is complete, that it is solid is fantastic. Well done for that. However turning it into a business may be impossible, or expensive. That's OK. Celebrate what is is, don't pine for what isn't.
If nothing else you've learned the difference between a code project, and a business, and if you internalise that then you will have gained something of high value.