There is no guarantee that Enzo Maresca will make Chelsea's performance much better next season, I think Enzo Maresca is currently taking a job with very big risks, as we know in the last two seasons Chelea's management has fired many coaches and it is possible that Enzo Maresca will suffer The same.
Chelsea management made many mistakes, they wanted instant results and did not provide full support to the coach so that the team's performance could not improve, so if that continues to happen I am sure the same thing will happen to Enzo Maresca.
Can't predicting with Chelsea will have better performance or not under Enzo Maresca before watching their pre season match early, considering his achievement made Leicester City taking one season only for promoting to Premier League I think Enzo has potential make Chelsea performance better than in this season after failure reach the top fourth standings place.
Chelsea's management have bad decision when bad habit sacking manager early before giving them more time bring Chelsea to top level performance, but under Enzo Maresca if first season bring back Chelsea to the Champion League spot standing I believe has opportunity extend more than one season than previous Chelsea's manager have one season only their opportunity.
Premier League is not easily for predicting behind many mediocre team make us surprise with their performance, actually not sure yet with Chelsea will reach the higher standings for next season before watching Enzo Maresca tactician in pre season matches and premier league matches.