My daughters 97 Avalon blows the brake light fuse about every other day.
I thought I'd eliminate some wiring as a troubleshooting procedure.
There is a connector block on the side next to the drivers foot.
I found the brake light wire at the connector and in the trunk.

Modern cars have lots of things connected to the brake circuit: cruise
control computer; engine management computer (strange, but true); "burned out
bulb" sensor circuit; as well as the shift lock-out solenoid.

You might unplug one section at a time from the harness for a week and see if
it still blows. "Long term" troubleshooting...

Good luck!