I have learned (from Sally Pointer, a British archeologist who studies traditionnal fiber arts) to make fiber out of burdock.
The process is fairly similar to
nettles (look at her YouTube channel) but burdock. is far more plentiful round here than
nettles. It's fairly foolproof and meditative (or cathartic for the "beating it with a rock" stage.
I made a tiny fairy coiled basket. It also makes sturdy cordage for tying tomatoes to stakes.
I highly recommend giving that a try.