Ethernet

Home uses xfinity wifi. Currently have two ethernet cablesrunning on the floor of my house from basement to two rooms upstairs (needed for work-from-home and gaming). About to get a puppy and need the wires run properly so they're not on floor. House has old, dead, coaxial cabling in each respective room. Debating getting MoCa adaptors but would need to. Run new coaxial cabling. Would it be better to just fish ethernet through the existing holes instead of new coax? Can xfinity come and do that or do I do it myself?