Hello,
It sounds like the clutch has worn and when it heats up it slips more (which is typical of a worn clutch).
When a clutch is worn, under load it will slip and the engine will rev almost freely without any forward acceleration.
It is recommended to change the clutch disk, pressure plate, release bearing all at the same time.
You also want to get the fly wheel resurfaced to remove any imperfection. This will increase the life of the clutch. The flywheel can be resurfaced in most auto parts store as they typically have equipment to perform the service.
Here are some helpful information:
https://www.2carpros.com/articles/inner-workings-of-a-car-clutch
https://www.2carpros.com/articles/clutch-symptoms
https://www.2carpros.com/articles/how-to-replace-a-clutch
https://www.2carpros.com/articles/pilot-bearing-replacement
I have attached the diagrams for your reference.
Please let me know of any questions.
Thank you.
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Thursday, August 19th, 2021 AT 10:28 PM