I'm pretty surprised Milan has so many low wages in their squad.
Milan did a whole restructuring after their latest ownership change with Maldini. They had huge wages and no success so they shifted the focus to young players with lower salaries successfully.
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Check for yourself, how many players in yellow there are
Honestly looking at this table with the steep financial difficulties we have, its difficult to justify Ronaldo for the next years.
Its clear that the wages need to come down a bit, and that there are better players in Serie A than ours that could help us do that.
Ramsey 8m -> De Paul 2m
Alex Sandro 6m -> Gosens 2m
Rabiot 7m -> Locatelli 1.5m
Right there are obvious moves that reduce the wages by 15m and that is after doubling (or more) the salaries of the new signings. Of course the new singings would come with heavy transfer fees but in the long term it should be beneficial still.
Then there are Ronaldo. Morata, and Dybala. One or two may leave and that releases a lot of money.