Mail won't open on MacBook Pro after Big Sur update

As soon as I updated my laptop, I opened all my important apps to check out the new look. Everything opened as was working properly. It's now a few days later of not using my laptop much and now mail won't open. It does not display an error message, it just shows my mail notifications and has the little white dot below.

I referred to other similar questions on here and tried the advice they gave, however, nothing has worked thus far. I tried going to ~/Library/Caches to delete anything there and then restart my laptop.

I also tried removing from dock and restarting with no luck. I'm wondering if there are any other options for getting mail open?

Thanks