Clutch petal hard to push

[PowerWheels]

I've got a 2014 GT500. Clutch was replaced 20k ago and was easy to push at first. About 5k miles ago I noticed occasionally it was harder to push. Last 100 miles it always hard.

Any idea what this is?

Cars not fun to drive currently.

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[PowerWheels]

Bump

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[L8APEX]

It could be the Master Cylinder, or bad linkage....
Whenever I've gotten new clutches (on cars with hydraulic clutch) I replace both slave and master cylinder as it seems to go out soon after.
Last was my ///M roadster, clutch grenaded downshifting to 4th coming off a highway... even blip shifting it just failed... there metal chunks and ball bearings laying on the bottom of the bell housing... Originally I just did just the slave and had to replace the master within a week, although for me the pedal engagement was weak and the point got closer and closer to the floor. Only clutch out of 5 different cars/trucks that I've had fail. The ///M was a dual mass flywheel and the rubber between the hub and friction plate was rotten. (went aftermarket to a more familiar sprung clutch and a solid aluminum flywheel.)