Repair a burned trace on a PCB
Scrape any solder mask away from the via and solder to the via itself.  Use very thin wire, since this trace is acting as a fuse.  Or throw this meter in the trash before someone gets hurt.

There's probably something you can do with conductive glue, but I have no experience with it.

Where else does the trace go?  You can connect anywhere else on the circuit node and it should work.  (Not always.)