After working an office job for 5 years, I’ve saved up enough to launch my own vintage clothing business.

I’m planning to focus heavily on tiktok for marketing since the vintage aesthetic is huge there. Already have about 3k followers on my personal account where I post here and there.
My current plan is launching online shop next month with marketing primarily through tiktok and maybe some ig reels. Already sourced some initial inventory from thrift stores. My biggest concern? I see so many people killing it on tiktok with vintage shops but the algorithm feels so unpredictable lol and I keep thinking that if I go with it I’ll fail right away (which is stupid I know)

Has anyone else been in the same position? If yes, can you give me some tips/advice?