No one is going to share goldfarming methods with you.
Sharing methods ruins methods.
You need to experiment and trial and error and figure it out for youreslf.
Once you have a larger capital, you can flip partyhats for 50-150mil profit per week. You'll make more money if you have an even larger capital and you spend more time in-game. Takes less than 10 minutes a day, and sometimes much less.
I've owned every partyhat except a blue because of this method
If you're playing OSRS, the way to make cash at the moment is have an account with good combat stats and taking advantage of the high prices of GWD drops. You can make some insane cash, AGS is 80M, which at $2.8/M is $224. Sweeeeet.
merching is my personal method. Just get known with the prices of the market you're going to merch ( rares, runes, herbs, bandos etc) and you will see how easy it is