Shifter is messed up

Sorry, I don't know your car in particular.

You mention master and slave cylinders, which tells me you have a manual box.

So if you say it doesn't go past 40,, in which gear is that? in 1st this would be normal and not recommended, neither would it surprise me in 2nd

in 5th gear it would certainly not be a good idea to try and accelerate at 40 km/h.

So stuck in neutral means to me clutch for bent or slave cylinder and or master cylinder gone.

The 'linkage would be a pipe,which is unlike to be damaged but then you never know.

How is your fluid level?

Have you lost a lot?

if so , check where it is wet and change that one.

If they are expensive for your car get a repair kit!