Consider the situation from your prospects' perspective: most likely your outreach is being lost in a sea of SPAM.

I am not a doctor, but my university email was somehow put on a list of medical professionals.

So now my university email is barraged with all sorts of SPAM targeting medical professionals. It's impossible to unsubscribe/opt out. (I've tried, but I keep getting added to new lists. It's like the original list keeps reselling my email address.) I'm sure it's much worse for an actual medical professional.

I'm assuming you're not calling (Even with calls, I personally don't answer calls from unknown numbers due to the SPAM calls. You need to be leave a text if it is important, or be very persistent.)