Best way to sell kpop things

Hiya I've been trying to sell some kpop stuff i have (ive been very unlucky with the amount of double i get) but ive not had much luck getting them to go I have some things listed on here then everything listed on vinted but no one has been interested ive seen some people do ot on instagram but i dont know how that works so I haven't tried it What methods has people had the most success with?