Hi, I'm looking for a novel in which the MC has become bored with his current life and has realized that he's not improving anymore because of mistakes in his past, so he makes the decision to cripple his cultivation and start again from scratch.
Sayonara Ryuusei Konnichiwa Jinsei . Not what you are asking but similar. I'm posting a review of the novel: " Ancient dragon got tired of living for so long allowed the hero to kill him. Then reincarnated to a human in which he enjoys life and still retains his ancient dragon powers which causes gods and demons to cower. A very good read. "