@Icryalot I read it a bit and I don't think it's what I look for. Most novel about video game (mainly VRMMO), stats and the likes aren't really important. "You have now two times your stats? The monsters you fight now also have two times the stats of those fought before". The MC grows stronger but so is his sourrounding, so in the end you don't feel he grow stronger, just that he changes scenery. In these novels, it's less about personal growth but more about influence growth. (They start unknown are build the biggest guild step by step). I may be wrong about OG but if it follows the genre, I am not too much interested (Though, it may be good, just not what I am looking for).
If I want to explain: In Solo leveling, he starts weak->gain the cheat->Fight Snake monster with difficulty-> Fight spider monster (same level as snake) easily; and at the same time you have people that doesn't change to show how much stronger he gets with each step.
In Death mage: he gains more and more skills, becoming able to make more and more absurd things but the skills he gains are logical, not random (Re:monster). For example: he can create basic skeleton at the start, and later he can summon advanced skeleton, ...
Another manga that I didn't mention is Kumo desu, but it's because it's only half what I am looking for: yes she gets stronger with the system, killing foes she had difficulty with before, but her growth is mainly dependent on the skills she buys. She doesn't gain these skills; it's like Re:Monster : the effects of the skills can take a direction she didn't have before. If the skill store in Kumo desu was removed, or more limited by your current situation, it will be exactly what I am looking for. (But there is also the turn it will take soon. Sigh)