I feel like he hit the limit for that stat in the lower realm so when he gets to the next realm he can start getting stronger again in any of those stats that he maxed out
I had realised it when my stat points had reached 500 in Intelligence, strength etc. but that seemed to be the cap, I couldn't go any higher. Was that the system's limit? How could I bypass it? I began to worry that my power would be somehow capped.