I'm siding with a lot of the other commenters on here, there's more ways to learn stuff than going back to school; even cheap or in some cases free classes both online and in person are a thing for instance.
The one exception to that claim is anything that's regulated in some way/needs a license, eg. driving a semi (need a CDL for that), going into the HVAC business (need a license to handle refrigerants), etc, those you need to go to school for, but things which aren't subject to government regulations on some level can be learned with a free or cheap course.