Going with agency accounts, especially with agencies that deliver a full setup, meaning anti-detect profile, proxy, clean Gmail, 2FA and ads account setup, really does help remove some of these factors. While nothing is foolproof, it reduces some of the suspensions, such as suspicious payment methods, circumventing systems (linked to fingerprinting, IP's etc.) and verification reuse
At least then it becomes more of a "you" problem. So if these suspensions keep happening, look to your domain, hosting, landing page copy, keywords etc
These days if there's a leak somewhere, no matter how small, Google will find you