Any tips on where/how to sell these?

Hey there! First time poster in here. What have a pair of Ugg ultra mini in rose grey that are too big for me. Unfortunately I purchased them last Christmas and living in Arizona never wore them. Went to wear them this past Christmas and realized Uggs aren’t the same sizing as normal shoes and they are too big for me. They are a size 7 and I found out in Uggs I wear a 6. I was unable to return them due to how much time had passed by. I even contacted Ugg and they wouldn’t do an exchange or anything as a year had passed. I have them listed on my Mercari and Poshmark selling pages but not having any luck. Anyone here have any other suggestions for where I can sell them? They were purchased at an authorized retailer so are 100% authentic. They are new in box. Only worn to try on at home before realizing they are too big for me. They are such a beautiful color and unfortunately Ugg is not making this color anymore or else I would buy my accurate size. I ended up buying a black pair instead over the holidays. Thanks in advance for your help!