If Chelsea buy Lukaku then their squad looks very strong with no obvious weaknesses plus the players they signed last year will be used to English football and so should improve. Their younger players like Mount also have more experience. They also have the benefit of having won the Champions League last year so they can effectively prioritise league games whereas we will need to go strong in both.
On the other hand I am not sure that Tuchel will be able to keep them consistent. Our lads know what it takes to win the league and that is a big plus on our side.
I expect one of Liverpool, Chelsea or United to start strongly and maybe even get the bookies to pay out by December but to fade away by March.
Personally finishing in the top three, the Carabao Cup and getting to another Champions League final would satisfy me. I would like us to be a bit more prolific - 100+ league goals would be nice to see again.