kill till u get 450, when u do ur kit default, take the s1u1 sword, do /warp shop, enchant it with sharpness 2 (costs 450), sell it for 650-750 on ah. Also sell every single god apple u find for 900. If you drop down to pvp, drop in iron armor, collect loot, dont even have to pvp. Any diamond kit (default, daily), sell the armor for 550 if its p1, sell it for 650 if its p1u1. (literally say "max dura p1u1 set, 650, msg me if u want it" in chat until someone buys it) Until u have 20k, pvping in diamond isnt a thing u should do if ur trynna rank up.
Once u have about 1k-3k from selling ur kits (u can even start while ur still selling them) ask in chat if anyone can sell u god apples for 500-600 each (make ur chat msg stand out, use ---------------------- to make people notice it). Sell them at 900 each. Repeat until u have enough money to buy instant damage pots, or until u have 10k and can buy an s4 (7-8k max dura), which u can then sell for 12k. 2k profit doesnt seem like much but considering u were making 100-500 profit before, its decent. It gets faster and faster as u move up, till u reach around 30k, then it slows down to maybe 20-30k a day, higher value items are rarer. I constantly get stuck at around 150k-200k, no one sells anything for a day, i get bored and give it all away, then i restart.