Your M dictates your play. With an M of 5-7, you're playing push/fold and reshoving for value.

7-10, you're raising to open up reshoving ranges because you're not raise/folding outside of a rare case where you get reshipped raising a hand like AQ or 66 in EP.

10-15, you can blind steal and play a little more postflop in position, limp/reshove with FE.

15+, you can blind steal and play a lot more postflop from all positions.

But your M is only as big as the smallest stack left to act. If your M is 15, raising ATC from the CO with 3 stacks behind you having M's in the 5-8 range is suicidal because they can reshove you profitably with ease.

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