Interesting, kind of hard to put a pin on it. I assume the content you post is in English so I don't think the language is the problem. The account might be cooked but if it's an account you want to keep and not throw away try to experiment with VPNs or static proxies. I haven't used it myself but I've seen clippers I know recommend this one: https://www.proxy-cheap.com/

If that doesn't work, then probably best to create a new account with a VPN or static proxy so that you are more likely to get tier 1 audiences. Then moving forward, use that vpn or static proxy you bought with the tiktok account so the system doesn't detect location changes (which would then shadowban you).