Unless it was an update in the latest patch, I am getting tons of missions.
There was a thread about a level 21 running out of missions.
I am level 22 and I keep getting missions, especially from Socrates.

Jut this morning I revived an e-mail from Socrates and I revived 6 level 22 missions. I already had 7 level 22-24 missions.

If it's the patch, then that was pretty damn fast.
If it's just not knowing where to look. Send me a PM I will be glad to guide anyone having issues.