The hand / foot biting nearly drove me to despair when ours was a puppy.
We were recommended using these really hard chew sticks called a bully/pizzle stick, google what it is at your own peril, but one of those used to last months when she was a pup and was a great way to distract her from trying to shred my jeans, and we also used it to placate her when she was trying to settle in the crate / night time / anytime we needed to work from home. I think other people use Yak sticks but they may not be available in Spain, we can't get them in NZ.
I really liked channeling that bitey play into playing tug with the dog. We made some from plaited microfibre cloth strips (we were in lockdown and it was all we could fashion), now we have a tug toy from Tug-E-Nuff in the UK and it's great.