If he keeps his scoring/assisting record AND improves overall in all other aspects (defending, pressing, synching with others in attack), then obviously 30m is a no brainer
Currently he gets 14m gross. He was getting 18-9m gross at UTD
I would say a fixed base salary of 12m gross, with bonuses up to 6-8m gross would be a good offer for both parties.
PS: For context, Lamine has a new contract of around 16m gross base, and 10m gross bonuses, and Fatporta's intention is this to be the highest contract at the club