Only send it again if you don't receive any response in a few weeks/months, I've personally sent Cyrus PM every two months when I wanted to recover this account.
Also, you might want to use non-generic name on your PM, maybe something like "Help, account lost and need it to be recovered (signed message available)"
That name will catch Cyrus or Theymos more as they also received spams everyday, you don't want your PM's to be put inside spam folder
I've left a feedback too, but since I'm not in DT it won't show on your account.
If you got your account back, you can send me a PM and I will remove it