What is the best way to store players data in multiplayer online game?

I have very limited time to provide users support beyond email replies (I can reply to emails freely while I’m at company working, but not much beyond that);
So I always publish “my UE4 stuff” for free or minimum fee possible as a result of my lack of providing extensive support to plugin users.

So, I don’t know yet what Epic Games’ Marketplace Team think about this.
I am waiting on their feedback to see at what price range I will definitely publish it…
I am thinking about below $50, at some point maybe even publish for free, I don’t know yet.
If a package is “too cheap” or “too expensive” they usually provide hints on the subject and suggest changes, otherwise they won’t even talk about it when it’s ok.

However the “C# Service”, that links MS Server to this SQLite plugin, isn’t hitting Marketplace because that software I made when I was under contract and technically speaking that source code is not my property then. So I’m waiting review process to publish only what is seen in that video.

I could publish for very high price and provide dedicated support;
I could publish for low price and provide minimum email support;
I could publish for free and provide no support at all…

I personally like second option, because I like getting in touch and see what people are doing with it (and help when I can), while being able to invest some time on other things.