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buy and sell stuff, never hold any stuff for too long unless you're hoarding them.
hoard items for an amount of time till you are satisfied with the total amount of gold you will obtain from selling them then sell them.
buying items that cost 100k-999k usually wont bring a lot of profit, since you'll only have like 10-50k profit, while buying item under 100k will give you the same amount of profit like you sell 100k-999k worth item. eg, I bought lusty for 550k, I sell them for 600k. meanwhile, I bought crescent cowl for 50k but I sell them for 100k. So its the same amount of profit but you buy it cheaper.
the rest depends on your own judgmental abilities, intelligence and luck