Colak would get you around 20 a season, but he can’t lead the line. He is the guy you play at home against the jobbers after a tough midweek European game. Boyd Mkii, and even then he is not just as prolific as Boyd. Whether that is enough to keep him I don’t know. Likewise Sakala, I just don’t see him as a starter for us in the long term, albeit he still is effective enough on occasion for SPFL level.
We need at least 2 quality number 9s in the summer, no question. Plus a RW, and another LW if Kent leaves. Matondo and Wright ain’t good enough either. And I don’t think Hagi has the pace you want for that RW role.
Perhaps we could use Tillman in a De Boer role, but that means you need intelligent strikers with good movement, as opposed to wingers, alongside him.