Tiktok shadowban my main creator account, and now they are also limiting and destroying reach of new accs, should I like switch the devic

yep, happened to me. no idea why. what type of content did you have?

you can try resetting your device with a new icloud and registering email + warmup the account for at least a week before posting. If that does not help I would get a new device, new icloud, new simcard and only use simcard internet. Ofcourse never share already uploaded content to your new account, they will instantly connect it to your old account