Sliding Glass Door Rollers
I’ve done both of my sliding doors few years ago when I was younger, this not for faint of heart (weak) or lack of basic skills. The door’s heavy and probably [all same as mine] bottom frame has to come off due to the roller assembly in cased in lower frame. The rollers come in 3 sizes starting 7/8” and up. You have to know which size rollers you have so the adjustment will work. Too small and won’t roll easily cause the adjustment maxed out. You can buy rollers or bracket and roller assembly. Any handyman should be able to do this. Price depends on parts, lower track condition and labor.
You could try to clean up track and adjust roller up if the roller adjustment screw not corroded and locked up?