Chelsea may want to return with full force to perform well next season, but I don't think it will be possible in an easy way, because even if the team has a good coach and still the player didn't perform, nothing is going to change the team the following season. Chelsea always spends money on young players, and that is the main factor that is affecting them because lavishing young players with money causes them to perform poorly on the field.
Although I am aware that paying a premium price for a player is a good idea and that good players deserve the best, Chelsea purchases players without first determining the team's problems. As such, I would advise Chelsea to thoroughly investigate the squad before adding any more players.
Am not expecting anything special from Chelsea at the beginning of next season, having a new coach is not really easy, its going to take time before the coach will be able to adapt with the players and am sure Chelsea will be getting new players, Pochettino is really having a lot to work on, because Chelsea is really lacking behind. Its not all about having experience coach alone, Chelsea also need experienced player's that are really ready to work for the club. Chelsea spending money on young players is not really the problem, what i believe is that Chelsea are not going for the right young players. Arsenal are also using young players but we all saw they performed well last season.