when you upload with your home wifi look at the location on tiktok before you press "post", it will always show your location from that where your wifi is, so you dont will upload for example in the usa also when u have a us sim.
i can upload in usa also without having a usa sim card, you dont need that.
there are other things you must change

(on your phone)
i have also a modded tiktok app, where i can see in which country a account is posting, and i am 100% sure you dont posting in the usa, when you using your normal wifi and you dont stay in the usa with your wifi, If you want you can sent me your acc link and i can say you where you are posting, or you comment it here, then everyone can see, thats its right what i am saying, and it is not a front.
i do also stitches and posting only in usa with 60 accs already.