How Should a Person With Waswas Deal With Doubts About Kufr and Mistakes in Prayer?

Assalamualaikum I have heard about the term Fatwa shopping Where people affected with waswas (example: thinking they are out of the fold of islam) , ask fatwa A lot and thus are advised to not ask any questions Is that also applied if a person makes mistake in prayer intentionally, pronouncing a letter differently but not knowing if it's a mistake or not but still did it but could had pronounced as he / she always used to . Should the person repent sincerely Or the person should repent sincerely and check if the meaning has been changed and if it gets him/her out of the fold of islam.