The locksmith in Dayton told me my deadbolt was 1/8 inch off, and it fixed 2 years of sticky doors
I asked him to just swap the lock, and he pointed at the strike plate and mentioned it sat 1/8 inch low. After 20 minutes with a chisel the door swings shut with one finger, so what small fix did a pro point out to you that you had been ignoring for ages?