But to reduce the amount of key pressings I use the app WaveUp (F-Droid) which allows to wake up the device using the approximity sensor, this means completely without the Power key. A device can be run for weeks without a single key press this way. This could also be a help when the key is already demaged.
An FP3 has the approx sensor at the top near the LED.
(I would like to have a screen gesture for that. Blackberry devices had a swipe from the bottom to half of the screen for wake up, easily executable with a thumb and robust enough for every day use, but the WaveUp developer says this is too complicated.)
Use the search function of the Settings to search for “camera” … it’s “Jump to camera” then.
I would advise to contact /e/ support nonetheless if the phone was bought from the e foundation.
Fairphone support would need you to install Fairphone OS again first before being able to help.