Any hope for Chelsea for 2019/2020 season?

With Eden Harzard departure to Real. Madrid, and the rumored departure of Sarri to juventus, so What is next for Chelsea football club? After Chelsea finished last season with a fairy tail ending, winning the Europa league trophy at the inter baku stadium, all seemed well but it's wasn't. We all knew that hazard was playing his last game, we have a transfer ban hanging over our head and we still don't have a central striker that can win us the tittle. Little did we know that juventus will be poaching our Coach and our youth prospect have started having season long injury. So many weak old players who are well over 30 are the ones that will be leading the Chelsea attacks in the 2019/2020 season and their days seems numbered in the Chelsea colors. A lot of work as to be done on the Chelsea squad. The only happy news we have gotten so far is the news of the arrival of Christain pulisic to the Chelsea squad and also the five years contract singing of callum Hudson odoi. This at least will bring a fresh look to the Chelsea attack with fresher and younger legs troubling the opposition defense. What should Chelsea do to have a successful 2019 /2020 season. Firstly they should try all their best to make sarri see reasons to stay, either by increasing his salary and giving him funds and more control over the Chelsea transfer handlings just as how pep and klop has at mancity and liverpool respectively