For now it seems like Joao Felix is staying at Atletico Madrid. He has been rumoured with some teams but his asking price is quite high. In this case it wouldn't be easy for him to be signed on a permanent deal. He still has 4 more years with the team as well. I think the biggest thing that can happen now could be to see him being loaned to another team again.
Until Simeone leaves the team which is likely to happen at the end of his current contract Felix is likely to continue his life like this. But after Atletico Madrid bring a new manager Felix can start to find a place for himself in the team finally maybe.
Joao Felix is a prominent player who should be given adequate playing time, but as a result of recent developments, he has been denied this and is being used as a backup player, which is rapidly eroding the player's skills and abilities. He keeps fighting to make the first squad, but the head coach, Diego Simeone, fails to reimburse concentration; his attention is elsewhere, and there's nothing to show that he has resilient strategies in mind for the Portugal international. Athletico Madrid keeps stressing out the bidding process for this player, he's young and capable of achieving alot if sold to any potential club.