Kindly refer to the following link(s):
https://www.assimalhakeem.net/i-m-suffering-waswas-during-prayerwhat-should-i-do/
Seeking refuge in Allah from satan silently & blow on left side (in prayer & outside prayer)?
How to seek refuge in Allah from satan in prayer & outside prayer? Dry spit 3 times? (in congregational prayer)