Better go away from Lukaku. He is not worth that much. If Abraham wanted to move just get loan move for greizman.
Wait for next summer for striker move till then improve midfield and defense.
Cho, pulisic ,ziyech, mount and havertz will be expected to deliver better from the start so scoring goals may not be a big problem like last season. Werner almost like toss the coin right now. I hope he will deliver when he is needed.
My biggest worry is midfield. If any one injured or suspended from three(kante,jorginho,kovasic) or needed rest, chelsea are too thin to rotate in that circumstances with out drop in quality.