My main striker this year improve a lot when I changed his partner in attack, first he was good in assistance, but scored few goals, now he has decent (really good!) numbers.

Before the change: 6 matches / 1 goal / 4 assistances / 0 MOM
Later the change: 12 matches / 11 goals / 4 assistances / 3 MOM

I bid a tall striker (195, 92 kg) and maybe he fight with the defenders meanwhile the main striker scored

Think in this before to sell this player.