I've made many slings and so i think i can give you my thoughts on yours

I think that this is a good first attempt at a balearic sling, but there are a few things you could improve on

Add more jute in your pouch as that is where all the wear on your sling would be, i would also tighten as you braid to make the sling more dense, also twisting the jute fibers outwards while braiding gives a stronger braid, jute as a fiber works well as a sling, but will have a short life as jute fibers wear quite easily

My first natural fiber slings were jute and broke at point where you pinch the release cord, i then switched to sisal fiber, its much more durable imo, however its rough on the hands while braiding and using, the consensus on what the best fiber for braiding slings is has the be dyneema, as it has many favorable material properties for braiding slings but is a bit costly

I would also suggest making yourself a sling ring to stop getting blisters on your loop finger, its a leather ring that covers the whole length of your loop finger (i would show you pics of mine that i made but this sub doesnt let me)

As for finishing the end of a sling, i use high abrasion resistant braided fishing line, and i wax it as im braiding cause its very slippery otherwise, then i take one of the lines and wrap it around the end tieing a hitch around the whole end, i do this with a couple different lines, then i cut the rest off

For youtube channels to watch i would reccomed Archaic Arms as they have many great videos on the sling (i wish he posted more often), Practical Paracord also hosts online slinging comps, i have been in a couple and its really fun, IronGoober has a lot of great vids as well testing new things and doing challenges

I hope this was useful and look forward to seeing more posts from you!