Read more by authors you enjoy in a subject you enjoy (and plan to write in.)
From a quick look at your story, I believe you need more experience and exposure to English grammar and story flow structure.
Someone once told me I'd need to read 10 million words and write a million before I'd start...
Don't sweat it. As long as it has litRPG elements and you are consistent, tag away.
If it's an element that appears once then never shows up again, then yeah, maybe ditch that tag.
When you copy text, it can have hidden 'styles' and such integrated into the copied text. That's why there is often a 'paste in plain text format' option when right-clicking in google docs, Microsoft word, etc.
Really caused me a lot of headaches getting all the styles and such sorted out since...