Person from osrs trying to play RuneScape, how do people afford gear??

Maxed stats from way back in the day but gear is ridiculous. Pvme recommends maxed gear for everything. The things I've tried are extremely hard and kill me quick. I've watched tons of outdated videos on how to heal in fights with no food but I'm getting my ass kicked everywhere. I don't know how people go from the final necro set upgrades to rasial gear without getting lucky somewhere first. I want to do bossing but earning the 2bil for gear will take months. What's the secret to getting gold? The money making guide methods are hundreds of hours just to afford anything decent.