I don't have much advice but two years ago I was in the same position. I'm pretty good at art so I did art commisions from various online platform and sold my old books. Books are in lot more high demand than you would think and as long as it's in a good condition people will buy it. I was able to sell all my old highschool books and sample papers ...... reply
I don't it's that accurate but I did it three times and even chose different answers but still got this every dang time so ig faith (~‾▿‾)~ reply
want to do read 1000 manga or more
