Same situation. Really, there is no way to jumpstart libido except by possibly being with a real girl or masturbating a few times (the masturbation does not work with everybody, and in my opinion shouldn't really be considered at all, since the flatline will eventually go away on its own).
You just have to endure it. The only advice I can give you is to remove the most amount of stress possible from your life.
I was very frustrated with the flatline. In fact, I had a 131 day streak before this one until I relapsed once to porn because of it. Because the flatline makes it extremely hard to do things like exercise, meditation, kegels, or anything in general, here's some little things what I found you could do that makes things a lot easier by simply reducing stress.
Since addiction can cause you to be dehydrated without even being aware of it, a lot of stress can come dehydration. Make sure to get at least 2L of water per day. I personally drink 1L after I wake up to get things going, and 1L during the rest of the day. You wouldn't believe the world of difference it makes on reducing stress (and stress tends to increase urges too!)
Although you'll feel always restless on the flatline no matter how much sleep you get, not getting enough sleep makes you feel even less energetic, more negative, irritable, cranky and irrational. I had no sleep on the night before my relapse, and was acting out completely irrational that whole day, so watch out for that.
A huge stressor (in fact, the main reason for relapse) is loneliness. Connecting with people or talking to somebody about your problems who understands and supports you makes you feel less alone in the whole thing. You don't have to tell everybody about your problems, but just interacting with people just seems to help us get out of ourselves a bit, and focus less on our own problems.
Hope this helped