Chelsea's poor performance is mainly due to some bad management decisions. It takes a long time for a new coach to stabilize a team. Stabilizing such a troubled team is no easy task for any coach. But the Chelsea management wants a quick improvement. This is not possible at all.
No team can achieve a long term success without having to wait to build a very strong and stable team for it. This could take years as it differs the team and the money they’ve spent on having such a very strong team. Chelsea wants quick change add improvement in the club which they just have to wait for a little more time after their failed seasons back to back from the time Tuchel left. Building a strong team as the old Chelsea requires a lot of patience and hard work and if they don’t want to wait for that time, they’ll keep changing coach till they don’t have anything else to show, no options to rely on than keeping a coach for a longer period which will bring them back to square one. Chelsea can still be great again, but they should stop sacking coach and allow them to build a strong and formidable team to rely on for years to come.