In my experience it was actions I wanted to see.
I think someone has recommended 'not just friends' there is also 'how to help my spouse heal from my affair'. Read those books to help you form a basic road map out of this.
There are a few things that you should just do. Absolutely zero contact with the affair partner is an absolute must. Transparency and honesty are a close second.
I get that you're ashamed and embarrassed, my husband was too, but being stuck in the shame, guilt, embarrassed cycle causes even more damage. What you need to do is start to really listen to what he wants so that he can heal and feel safe with you again.
You've been rugsweeping and minimising, own that, tell him you know you haven't worked hard enough and you're going to work. Ask him what he needs to heal and then follow that through with actions that prove he is a top priority to you.
I get changing jobs feels overwhelming but it's a healthy consequence of your affair.
The last thing I'd say is you need to really unpick why you had an affair (not marriage blaming, I'm no lover of affair apologists). What is it about you that allowed you to move away from your moral compass. How can you complete yourself without needing validation from others?
Good luck, no time like the present, if you want your marriage you now need to work for it,