Budgeting tips when income drops after 18 years as a social media manager

My income is now a fraction of what it was as a social media manager and I am trying to cover the essentials. Any experience at all would help. 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.

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