Some Ways I know:
First(1): you can sell some items in ah it is from 10$-1million$ it not a bad way but you need have items first !
Second(2):You can go scam people ( nah joking way do it and i will report to staff oK?)
Third(3): you can kill people ye there is a quest it infinity 10 kills = 10k$ it mean you can farm so good 100 kills = 100k$ = 1000 kills = 1Mil ( 1k/1kills) good way
Fourth(4): you can fishing ( best way) it is very good but maybe it boring ye it so much boring but you can sometime get rare items and you can sell it to player who need it ( some rare is: Stratified Ocean Prismarine,Enchanting Deep Ocean Orb,enchanted clown fish and you can combine fish to enchant it in warp fish)
Fifth(5): Quest Cloner clone so much account and then wait 30 minutes and do all quest it will give you 300k or more ( i forgot) a little good way
Sixth(6):Chest Looter: loot chest make op money and then sell it to player
easy right ?
Seventh(7) Pay Master: Pay to Win
OK and it all i teach you guy hope you guy be better
have a nice day 
First(1): you can sell some items in ah it is from 10$-1million$ it not a bad way but you need have items first !
Second(2):You can go scam people ( nah joking way do it and i will report to staff oK?)
Third(3): you can kill people ye there is a quest it infinity 10 kills = 10k$ it mean you can farm so good 100 kills = 100k$ = 1000 kills = 1Mil ( 1k/1kills) good way
Fourth(4): you can fishing ( best way) it is very good but maybe it boring ye it so much boring but you can sometime get rare items and you can sell it to player who need it ( some rare is: Stratified Ocean Prismarine,Enchanting Deep Ocean Orb,enchanted clown fish and you can combine fish to enchant it in warp fish)
Fifth(5): Quest Cloner clone so much account and then wait 30 minutes and do all quest it will give you 300k or more ( i forgot) a little good way
Sixth(6):Chest Looter: loot chest make op money and then sell it to player
Seventh(7) Pay Master: Pay to Win
OK and it all i teach you guy hope you guy be better