Bless you for not making people use Tik Tok.

if you have an iPhone I use the R Download shortcut and it lets you download a lot of things through the standard share menu

I haven’t checked, but yt-dlp supports a ton of services besides YouTube. It probably works in Termux.

There’s also a telegram bot

Depending on whether the video creator has allowed it, long press on the video and select “save video”.