level 3 will be easy as the first 2.
what kind of server u have? I mean you find 5* players easily or u get involed in bidding wars to take a decent player?
Thats the key for me...if u have a nice server then play level 3 then also 4 and reconcider then your strategy.

If u have crapy server u can still be nice for level 3 with ur 35 token per season,but u need more patience with ur team.
I believe that cathcing level 4 u will have problems by oldest players.
Also check tomorrow your opponents in the league..Probably most of the teams will be inactive..so easy run for the league.
Finally buy in the middle of the season,by replacing periodly ur older playes.

Hope i help u