I wanted to give an update in case anyone happens to be in the same situation and finds this thread.
Once I found out I was shadowbanned, I went through my posts and deleted all hashtags from them. I didn't delete them from every post, just from when I started having problems to most recent.
I then shut down all automation. I stayed off Instagram for 3 complete days. After 3 days I posted again and tested a few hashtags, my post still wasn't showing for hashtags. I deleted the hashtags from the post. I then stayed completely off of Instagram for a week.
After a week, I put a post up and used a few hashtags. My hashtags are now showing again. So Bob's suggestion of waiting a week did work for me. Now I'm going to proceed with caution with this account. I made the big rookie mistake that OP did, I kept using a lot of hashtags and using the same ones over and over. Even though they were relevant, Instagram doesn't like this. I hope this helps anyone stuck in a similar situation.