Budgeting tips when income drops - what worked for you?

I am $1150 short each month and trying to find it. I would rather hear the honest version than the polite one. The rent is fixed and the car payment is high. Any apps or methods?

Sell things you do not use. I made about $1150 from a weekend of listing.

A paper list of bills by due date helped me more than an app. I could see the month at a glance.