Running a cat 5 cable longer than 300 ft

I have two buildings that are not quite 400ft apart. I had a shielded 2-pair cat5 network cable laid between them (I didn’t know about the ~300ft limit on Cat 5 cables). Is there anyway to add a booster or other extension to the ends to be able to make the network cable work across that distance? I was able to get signal for about 3 days, then it just cut out.