06 toyota corolla not getting up to speed

Needs new clutch

if the engine rpm is increasing and the car isn’t going any faster it’s the clutch.
if the car won’t go any faster than 100 and the engine revs aren’t increasing, it’s something else.

Bring it to a mechanic. Cars can’t be diagnosed over the internet

You said it was revving up and not going any faster, your clutch is gone.