Most of the best advice is simply telling people what is already obvious to everyone but them. There's not a lot of evidence needed, and adding more won't help

Most of the best advice is simply telling people what is already obvious to everyone but them. There's not a lot of evidence needed, and adding more won't help if the person isn't ready to hear it. In "reasons why people misallocate practice time", akrasia ranks above the lack of research studies by about a mile.