Use a week of PTO, and rent a dumpster. Take literally everything out of the garage, and place any obvious trash in the dumpster. Start methodically moving things back in, taking care to ensure each item has a “spot”. Continue sifting through things and throw things away as necessary. Anything small that still works but isn’t needed goes into the sell pile, anything large that could be easily fixed or still desirable goes on the curb for free pickup. You got this!