Use win bonuses to win the CL. Even the highest bonus level can't negate the prize for the group stage. That's how I won the CL in Level 5. My group form was LLDWWD, and I qualified for better head-to-head. But wait for 2 matches and see your form, then think whether you really need bonus.
But if you have at least 4T, please buy a corner-specalist MC. What formation you play?