I called the national customer service center (800-375-5283) and told them my case was outside of 105 day period and would like a service request. The agent did it over the phone. They told me it may take up to 15 days before my request is actually assigned to an immigration officer.

When I visited local USCIS office via infopass I asked them what happens during that service request. They said sometimes your case gets "stuck" in the system (technical issue) and nobody notices it, and when they look at your case to do an inquiry per your service request they may find it and fix the issue. But I heard that it might not be helpful and the only thing I can do is to wait from another immigration officer before.

I really don't think it was coincidence that I got my EAD approval shortly after I requested a service for inquiry. I've heard otherwise before from many.
They didn't say that they would escalate my case, I used that word when I emailed them.
(explained my situation and requested to escalate my case). So here is brief timeline:

Service request over the phone: 11/22
Visited local USCIS office: 11/29
Emailed NSC follow up: 12/2 (Friday)
EAD approval: 12/5 (Monday)
Reply from NSC follow up on DACA/EAD approval: 12/6

Same thing happened when I was waiting for biometrics for 2+ months.
Requested service inquiry and they scheduled my biometrics within 2 weeks.
I know many people did everything they could and didn't get a good response.
Do it again. When you talk to a different immigration officer/agent, who knows?
It's not over until it's over. Good luck!