8% for 6 months, that's roughly 17% annually. i think it's quite low when we talk about cryptocurrency.
and your collateral doesn't sound interesting enough.
look for somewhere else where 17% annual interest is a good deal. perhaps, some banks or credit card companies can give you that.
banks work only with residents
You said that you have a residence in Belarus. Go to a bank there then and put it as collateral to get the loan that you want.
There is no bank to deny a house or appartment as collateral wherever you are from. Ofc the house must have a significant value.