FINALLY UPGRADED MY ARMOUR
I hadn't done many quests, so I tried Vampyre Slayer, but turns out my gear was way too good for it to be even a slight challenge. I also bought a nice cabbage cape to match the green colour of the Adamant Armour, can't get boots because for some odd reason it's not part of f2p.
Aside from the armour, I'd also done a lot of fishing, so I'm now at level 45 fishing (only using bait). The price of Herring is crazy, so from a ~14,000 Coin investment into bait, I ended up selling ~150,000 Coins worth of fishies.
I feel like after doing f2p quests and getting all my skills to around ~60 levels, I would be ready to purchase a hip.