I agree with Berze, the more complete your profile is, the more likely I am to have a positive response to a message from you. How you ask is also key. You might be better off starting by paying a tutor a few times and then asking others to have one time conversations with you.

Not uncommon*

Empty profile, no activities, maybe too direct? It's not common to have poor results, keep offering people to talk, help some people with Farsi, eventually you'll find someone. Consider putting your real photo in your avatar.