Hello Chiara,
First, there are significant differences between Music Therapists (bachelor or masters degree required) and therapeutic musicians……generally a certificate program.
I am a harpist and CMP (certified music practitioner), but not working in the field, I only do some volunteer work. You might look at the Music for Healing and Transition website and contact them for advice/guidance.
https://www.mhtp.org/
If you are interested in Music Therapy I would look for schools offering this major and do an internet search to see if what music therapists do lines up with your goals.
If you are not proficient on the harp you will need a good teacher, but maybe your college has one.
All the best in your search,
Susan Howland