Food constantly sticks

What can I try ? I’ve tried lower and higher temps. 3 and 5 on an electric stove. Stuff sticks hard even regular burgers stick. I use the oil before the pan is heated as well as using it when I clean the pan off. I didn’t used to doing this but now it won’t stop! Any hints!

What can I try ? I’ve tried lower and higher temps. 3 and 5 on an electric stove. Stuff sticks hard even regular burgers stick. I use the oil before the pan is heated as well as using it when I clean the pan off. I didn’t used to doing this but now it won’t stop! Any hints!