I have a few pieces of advice. I'm not too much of an expert however.
1.
Give everything weight.
If you're using stats, make sure they DO matter. Big numbers are always cool, but what do they really translate to? I've seen people chuck in 1,000,000,000 damage, and all it does is bleeds out an enemy. How high is 1,000, and what can it do compared to 100? Naturally, higher is better, but it can off putting as others have described it above (can really take away from the experience if high numbers don't translate correctly).
2.
Make the System unique
Naturally, a LitRPG is going to have a System of some kind. That's the heart of genre (at least in my opinion, and it kind of gamifies things). Give it purpose. Why does it matter? Giving it a reason to exist other than it just being there for the sake of the MC or the genre is probably another reason why people hate LitRPGs. If you can put meaning behind it, flesh it out, and make it matter, then it'll enrich the story.
Honestly, you can even chuck in several twists. Like an MC that's simply quantifying their abilities/skills, or has magic that allows it, hence the System. Or ever heard of the
Third Man Factor phenomenon people get during near death experiences? The System could even be based around this psychological phenomenon.
3.
Show stats and numbers only when they are relevant
I cannot stress this enough. While it's cool to show growth, don't spam them like the readers have short term memory loss. Put them at the end of crutial parts, or when they really matter. This leads to the next point.
4.
Don't just use stats as a means of growth
They need to physically and mentally show growth as well, and display these improvements. It feels cheep, and you usually want to show stats at the end to accompany the growth, not
be the growth. This also ties in with (1.) about giving things weight.
5.
Your characters, world and context matter
They all need to be alive, with their own motivations. I'm not sayign everyone needs a backstory. An aside of "a single mother, wanting to protect her child" is more than enough. If the MC is dangerous, then they'll naturally be defensive of their child. Despite how unrealistic the genre may be, there still needs to be a layer of realism (unless it's comedy or slapstick, then do whatever you want).
6.
The numbers Mason, what do they mean?
Calculate everything accordingly. It can be pretty annoying if there are inconsistencies because trust me, no matter how smart you think you are, the readers will be floors over you. LitRPG can be ruined by numerical inconsistencies.
Let's say a boss has X amount of HP, and the MC did X amount of damage. But wait, how was X amount of damage possible when they were only capable of less? Not to mention that the fight came down to the wire, meaning the MC's last, crucial hit wouldn't have been the final hit at all, so they should have died right then and there.
7.
Who has the System?
This is a big question only you can answer, and depending on it, it can change the dynamic of the story entirely. Everyone has it? What do they think of it? Is there a religion surrounding it as a result? Maximum level and the level distribution with the population?
If not, then what do normal people thing about those
with it? Gods? Deities? Good? Bad? Do they think they're all crazy because they're waving their fingers in the air like a Conductor on stage? Are they so vastly different that it's inconceivable?
It's all up to you to decide.
8.
Formatting will be your best friend
Looking at your work, I think you're already on the right track with the tables, etc. So good job on this department!
9.
Make a Mini Wiki/Glossary
You will probably require this especially if you have a
lot of terminology/things you and your readers need to track. I have one and it is currently over 15k words (too big for the traditional glossary). This is mine for reference:
https://www.scribblehub.com/read/52...ai-litrpg-gender-bender-story/chapter/538244/.
But from what I've seen in your current work, you have a recap chapter for the previous arc, which is such a good idea! I love it so much!
10.
Have fun
Don't let the numbers get the better of you. Have fun. You can completely disregard everything here and write what you want. There are no rules in the genre. Just numbers and stats in a relatively low-tech world half the time (which is probably another reason why people hate it, since it doesn't fit the setting well.
This is where the previous step of
Purpose comes in!