Hey Gabriel, I think the 2 best ways to improve footwork are on the table regular and irregular drills where you focus on keeping the ball on the table and just trying to move well and improve the speed of your footwork. The 2nd one is ladder and cone drills. Have a look at this video https://tabletennisdailyacademy.com/videos/3-simple-cone-drills-to-improve-explosive-movement/
This will give you some good ideas to get started!
