String Jewelry and Plank Make are pretty good methods, I think they're both around 150k xp/hr. Looking at current prices, stringing is ~6.3 gp/xp (using gold amulets, which are the only ones being traded in enough volume to sell), and plank making is ~2.3 gp/xp (using mahogany logs), but it's also a lot more click-intensive.
Another possible method is the Tan Leather spell, which requires the Fremennik hard diaries to use. It's only around 120k xp/hr, in-between the above two spells in terms of concentration needed, and requires more starting capital, but you actually make profit from using it. Right now it's ~-3 gp/xp using black dragonhide.
You can check the magic section of this site for more info on costs:
https://rsbuddy.com/efficiency