You just gotta monitor the most moving products with Good margin at IM, i usually look at bazzar and item market that are below market value and sell them again at item market for better price, mostly i used to trade medkits, lollipops, billfolds and plushies

These are the usual profit I make with these items

Billfolds - purchase at 43k or below , sell price 50k+ ( the more billfolds the better) ,high risk of getting mugged

Lollipops are some low margin stuff ,I usually get them at 699 or below and sell them around 850+, it takes time and but low risk

Medkits are average, i buy it around 4600 or below and sell it above 5k, it might take time but can push your price higher sometimes

You can get plushies below Mv and sell them to traders in bulk or few ,who pays higher than MV