2012 Mercedes-Benz GL-Class is slow to accelerate

It takes a long time to speed up I have the pedal to the floor and it wont go pass forty then it slowly makes it’s way to 75

we need a bit more info.
is it a diesel or gas engine?
is the check engine light on?
do you have any codes?
have you changed fuel and air filters?
have you kept up with the maintenance?

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You need to provide a lot more information including miles and engine type. Depending upon what the RPMs are doing in all of this…
High revs but not much movement could mean a slipping transmission.
Slow revving and gutless could mean a worn out engine, dragging or seized turbocharger, waste gate issue, clogged air filter or exhaust, etc.

It might help to know whether this problem came on suddenly or over time.