Simple budget for a tight month - first time posting

My income is now a fraction of what it was as a graphic designer and I am trying to cover the essentials. I have read a lot of threads here and could not find my exact situation. I am nervous about falling behind. Any apps or methods?

Sell things you do not use. I made about $200 from a weekend of listing.

Check for energy assistance programmes. I got a credit that covered two bills.