https://www.amazon.com/Sector-Eight-Perimeter-Defense-LitRPG-ebook/dp/B015JMSSJS
These are good, but I like Russian LitRPGs in general. YMMV.
There are very few tech or sci-fi books in litrpg right now. The big two were in your post, The Gam3 and Artisan, both have gone quite a while without updates.
The only other possible one is something called Crashed into Fantasy on RR here I've only read up to chapter 10. It's sorta a genre clash, don't know how it will work out.
There is a series on Amazon from a Russian author based on a loose interpretation of Eve online mechanics. The first book is on KU here the rest are not in KU. It was pretty okay.
Also on Amazon is the Omegaverse series here. It used to be KU but like everything litrpg, it's dropped out to regular kindle. The books are short but enjoyable. The setting is a VR game that might be a mix of privateer/Eve/Dust 514/Elite?
Can't think of anything more right now. It's a shame though, I love sci-fi stuff. You'd think there would be a plethora of books inspired by Star Trek, Babylon 5, BladeRunner, Doom and Shadowrun. Instead I have to scratch that itch reading Elizabeth Moon, Asimov and Anne McCaffrey's stuff while re-watching Babylon 5 and Ghost in the Shell:Stand Alone Complex.
Sector Eight (Perimeter Defense: Book #1) LitRPG series https://www.amazon.com/dp/B015JMSSJS/ref=cm_sw_r_cp_tai_0BrLDbEY150CK
if anyone is wondering.
https://www.goodreads.com/author/show/14386306.Michael_Atamanov
The author is indeed an Eve player; http://magicdomebooks.blogspot.com/2017/06/michael-atamanov-interview.html