Question on selling PS4 account

Guys hi all !
I have a question, can't figure out :
In General, in the future as I walked past exclusives this summer on PS4 want to sell it.
The question is : I don't want to give with it to your account, maybe it's possible he takes me in the future and, accordingly, PS5 games on it. How to do it. That is, I sell the console on which the game is bought with my account, but first before I sell him out.
Whether people play games if I go with him ?
I believe if he will remove the game that will not have them back without my account to upload ?
Can he get a ban or I in the future ? Well, maybe Sony will think that he or I stole the account )))
If I should change the password immediately after the sale ?
What are the nuances of such a sale ?
Why do not want to give an account, because if will be backwards compatible with the PS5 I'll probably want to play old games on it, and may still happen that, for example Last of US 2 on PS4 bought will receive a free update version for PS5, dream of course, but anything is possible.
Like everything they wanted, thanks in advance for the answers )!