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.
After making a splash with his desire to join rival club Barcelona two weeks ago, Felix is likely to stay at Atletico Madrid next season. Because Barca could not fulfill the purchase or loan from the ATM, as a result of his actions Felix received a strong reprimand from the ATM management and put him in a complicated situation. Benfica are reportedly interested in bringing their former player home, but that looks unlikely as they cannot do so except with a loan option.
After not being included in Diego Simeone list of priority players next season, Felix must try again to get his best performance for the remainder of his contract at ATM. I think in one or two seasons he can do it and be an important player for the club again.