Help with a brake bleed!

Hey,

I just got back from a trip with my mtb and had a rear brake failure. I tried bleeding the brakes but it didn’t help so I bought a new lever. I installed it and bled it and while it does make some pressure, it’s still a lot squishier than I’d like, even after pumping it up. I was desperately hoping to get it ship shape for tomorrow’s hydrocut party. Would anyone be willing to give me a hand either tonight or tomorrow morning to try and figure it out?

Thanks!