It is possible to join a nex group or RS gold carry on QBD until you have at least 95 Prayer, at least 96 Herblore and other Tier 90 gear. Skills-Some people hate killing things so I included this. Runecrafting. Go to the Runespan at level 1, continue to train until you reach the level 59 of Runecrafting. At 59 you can create double cosmic runes using the Abyss. The speed is up to 2m/hour. At 82, it's possible to craft double astral runes. This could be better than cosmics, depending on the GE costs. It is possible to make two natures with 91. Check GE price again to determine the most effective.
Herblore. You can train in normal fashion or join daily warbands until you attain a certain level. Create unfinished potions (water and a plant) and then sell them. Crafting. Shades of Morton. Repair the temple and create sacred oil with OSRS buy gold olive oil. 1m/hr and extremely AFK