As far as I understand, you have no problem with Google bans. If you or your colleagues ever need old accounts or payment methods for accounts, then you know where to find me)
Regarding advertising, I can say the following. The world is changing, we can see this, and of course the advertising environment in Google Ads will also change. If we cannot adapt to the new circumstances, then someone else will do it and throw us out of business. Therefore, experimenting and finding the best solutions is all we have to do.
Everything very much depends on the niche.
In general terms, it looks like this:
1. Farm account or old account
2. Warming up your account
3. Cloaca
4. Adding a black keyword along with white
5. Smooth budget increase
Depends on what niche you have. I am using KeyCollector to collect keywords