Chelsea players' confidence has grown after they won the Conference League and Club World Cup trophies. Based on their performance on the pitch, they have improved, their success in beating PSG is a benchmark of their hard work so far. I'm not sure Chelsea can compete with Liverpool or Man City for the EPL title, but their resurgence will increase the competition for the top four and the EPL will become more competitive as more teams compete for the elite positions in the standings.
Enzo Maresca will continue to strengthen his squad's depth to compete in several different leagues when the new season begins. His success in his first season in charge of Chelsea was the first step in the team's revival. Now that they have won a prestigious trophy, they will no longer be underestimated in the domestic league.
If Chelsea can compete against PSG and also go ahead to humiliate them in the CWC final then why can’t they compete against Liverpool and Manchester City? Chelsea have put together a good squad this summer, a squad capable of even competing for the league title so you should beware of Chelsea next season because they are a big challenger for titles next season.