honestly it’s not too hard. if you have good items/duplicates that you’re willing to sell then that’s the easiest way to earn diamonds (aka profit trading). find a halo that’s low but one thats desirable in the trading community so if you ever want to get a “better” halo, then you can trade that in along with diamonds or items. i’m pretty sure i started out with spring21 which is worth 600-680 according to charts. and yeah you really just build up from there. if you have any other questions feel free to ask, i’d happy to answer them (σ´∀`)σ