Herblore. Do daily warbands or OSRS gold train regularly until you reach an appropriate level. Make unfinished potions (water and a herb) and sell them. Crafting. Shades of Morton. Repair the temple and create sacred oil using olive oil and the sacred flame of world 88. 1m/hour and very AFK
Miscellania Management – Complete both quests within the area and increase the amount by 10m (maximum) to your account. A proper allocation (I do mahogany logs of wood) will result in around 160% ROI. Player-owned Ports - Can earn millions every week in only 5 minutes of effort every day. It will take you work for at least a year. You must also be able to create items and start ports (level 85-93 is the best for everything).
Shop buying - Buy out shop supplies, like feathers. Kill Hill Giants in the Edgeville resource dungeon. Grab the bones and the limpwurt root.
It is possible to play the Lava Maze using muddy keys, however only important stuff you need to take (anchovy pizzas are not permitted). This is the most efficient way to make f2p money. I'm estimating 400k/hr however, it takes time to collect muddy keys. Gem bags are the best choice for the highest efficiency. Mine adamant ore. That's what I love about it. It's simple to mine in the hobgoblin mine. Hop worlds. You don't even need to think about it because the PKers are scarce in this region. To cheap RuneScape Mobile gold make your journey longer, you can heat coal through mining. I'm not sure if it is better. 70 miners required 70 smithing is required when you're superheating.