Your deadlifts looked pretty good.
A bigger question is are you following a program and is it balanced?
That is what you address before adding in extra work.
Assuming it is balanced, there is not too much you can do at home for your back with no equipment, but you can go in the video library and search At Home. You’ll find tons of stuff.
As far as things you can do with minimal equipment at home or in gym:
band good morning
band pullapart
pullups
scap pullups
fat guy pullups
banded rows
