This could possibly go in another category but I figured it is literally a question so why not put it here...

My crafting level seems to have plateaued around level 14. I was wondering if there are any known strats (high exp recipes etc) for grinding to higher levels? I've been trying to diversify what I make to see what provides higher exp but nothing I've found seems to be really efficient in terms of low cost materials + high exp return. Maybe there isn't anything, and I just have to wade through oceans of bone paste to get there... But I'll take any insight from people who like to craft...!

I'm pretty sure its still bulk crafting bone paste. GraveGuardian did a deep dive in profession experience. Here is a link to his Xp guide, https://www.lorwolf.com/Forum/View?id=14203. You can find more guides and helpful links at the Othenia Public Library.

Once I run low on bones, I switch to crafting piercing using the highest level metal I'm willing to use and all the bone paste I have created.

Oh boy! Crafting! 😂 Another user, GraveGuardian, has an amazing guide with a crafting efficiency spreadsheet.

The single most efficient way to boost your Crafting XP is using the level 60 Mass Bone Paste recipe. You can purchase that recipe from the Crafting week store for crafting vouchers. At that level, bones can be hard to come by, so I usually store up batches of a few hundred so I can make 5 of the Mass Bone Pastes at a time for over 1000 XP! 🎉

Farming integrates really nicely with crafting. You can farm Cotton and Pumpkins and make, essentially, infinite cotton thread and jack-o'-lanterns. I have over 5000 of the smiley things, they've carried me quite far through my crafting XP. ^^ They aren't the most efficient, but you'll be making literally 1000s of items, so things that you can get near-endless resources for is a great bet. Don't spam out, like, lorium earrings or something lol. Ores are way less common!

To add on to what others have said -- Jack-o-Lanterns aren't the most efficient in terms of XP, but they can be nearly infinitely crafted AND they are a good pebble return if you choose to sell them from your inventory, since they convert a Pumpkin + Candle from 17 pebble sale price (2 + 15) to a 400 pebble sale price for the lanterns.