Before just replacing the blower, be sure to check the heat exchanger for age related rust, pitting, our old Carrier still worked, but was a good 20+ years old, and it’s heat exchanger looked dicey, went with a new Trane higher efficiency, etc, used a local long time dealer who’s been great… Once the old was out, on the truck, you could see heavy damage, really just because of time, that pretty much justified the update, replacement alone…
New furnace, smart WiFi accessible thermostat (Honeywell), set our minds at ease…