Budgeting tips when income drops (Albuquerque)

I am $450 short each month and trying to find it. I am in Albuquerque, in case local advice matters. I am nervous about falling behind. Any apps or methods?

Sell things you do not use. I made about $450 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.