The top level increasing by one each season is becoming problematic. Lower Level Teams take forever to catch up, and it becomes too hard to go up two levels around level 63. You are seeing a lot of teams retire 3 or 4 seasons before max level because of this. I suggest you cap level limits for a while at level 70. Raising the level limits was a good thing, but now, you are losing teams because they can not advance.
what they do is start new teams at a higher lev