Yep I have clickable link on my bio, I use it in different ways, a link, and also a message to do something!
You cant send clickable links in dm's but you dont need to, just sell direct like i do --->film your product--->but DONT do it like your selling something, just do it as a "look at my new xxxxx" and if you know what you are doing with filming and timing thats all you need, then when people enquire about it you hit them in the dm's for pp 4 invoice, done.
I dont know why so many people overcomplicate tiktok, just do what IT WANTS YOU TO DO, not what you THINK you need to do.
It wants you to record short interesting videos that people want to watch, so give them that.