Scrum (and LeSS) are intentionally incomplete, just some feedback loops to aid learning, and some empty space to put the people doing the work back in charge of how they do it.
Unfortunately these gaps often get filled in with things that reduce agility, see Things Ken Schwaber Intentionally Omits From Scrum.
Here are some things beyond Scrum that can increase agility:
Try Test Driven Development
Try Mob Programming
Remote Mob Programming
Working remotely? Try remote mob programming