You have already taken the primary reccomnded treatment for Bell's palsy
You can ask ur physiotherapist for facial exercises and practice those home , and continue electrical stimulation as per the physiotherapist recommendations
Shockwave therapy is not evidence based. I won't recommend it
Next Steps
Just give ur self time. Most of the Bell's palsy case gets normal in a few weeks, and you will be fine .
Health Tips
seek doctors' attention in case if you feel new onset of loss of sensation or motion from the affected side or any other part of the body.