In video games when you level up, you gain new skills and stat points.
Yes, this is very true, and I personally feel that this is a major drawback of this game. You level up and level up, but nothing changes at all, because you are playing with other teams who are at the same relative level as you. In fact, when you reach high enough levels the game becomes more boring, because by that time you have already built your top level stadium, so you no longer spend money on that, and they begin to accumulate in billions. Besides, at certain level the value of all players reaches certain maximum (apparently set by Nordeus to maintain semblance of the relation to the reality), so at that point all players already cost the same, and you can't determine who will be trained faster, and buy them. In the past, at that point it was possible to abandon your team and start from scratch with a new team, which is what I did once, but half a year ago this feature was removed.