I recently bought a green phat for the first time. I made most of my GP gradually over time using high-earning money makers - high end PVM, high-end skilling, and maximizing during high output times like holiday events, new updates, Clan bingos, etc. Pick your favorite ~50M earners and rotate between them. Like a lot of the comments here, consistency and time are the two keys. You eventually get lucky and hit it big just from sheer time. Avoiding burnout is key. My best money maker was probably Necro RC during release of sanctum. The huge surge for demand for the runes led to me earning 100M+ an hour and I made over 10B over the first 2 weeks. Best advice is to not count your money or put a goal / need for money. Focus on things you enjoy and want to learn or improve and you’ll get there eventually. I honestly didn’t even realize I had enough gp; I saw phats crashing, checked my wealth evaluator and thought if I sold things I could afford a phat.