I've been building websites for a very long time and have had many websites wiped out and banned by Google.

Almost every few years, I somehow end up getting wiped out and have to restart almost from scratch, so I understand the pain.
I used to have blogs reaching around 80,000 organic visitors per day, then got wiped out. I tried starting around 30 new blogs, but none of them showed any growth. So I went back to the adult niche because, for now, these big companies still aren't as focused on it.
After testing many different niches, the adult niche is the only one that hasn't been affected as much by these corporations. I'm not saying the adult niche is easy, I had networks reaching 1.5 million visitors per day that also got wiped out, but overall, I think it's better to stay away from niches where there's too much money to be made.