

What is the best way to fill these gaps at the base of my interior door frames?
Had floors replaced 5 years ago and it left these gaps. What would be the best material to use to try and fill them? Would need to be robost to Roomba, mops, kids etc.
Edit: just to clarify, looking for cheap options i can do myself. New door trim or raising the floor are not viable.
Edit 2: im gonna try caulk with small backing pieces, based on this vid: