Getting back into fitness after a 7 year break, can’t do a single pull-up anymore, suggestions for alternative exercises?

I’m in my 40’s, haven’t touched a weight in 7 years, I got bad case of dad bod.

I don’t have a gym membership anymore, but I have an adjustable bench and adjustable dumbbells, and a pull-up bar.

Turns out I can’t do pull-ups anymore. Any substitute exercises that can help me get back to the point of being able to do them? Dumbbell pull overs?