IMO, the frugal aspect comes down to spending money on things you value and stop spending money on things I don’t value. During the workweek I carry around my own coffee thermos and pack all my own meals made at home, but if I want to go out to dinner with my wife I do because we value that time.
Also, I try and find ways to buy the things I do value for less. For example, there are tremendous ways to “hack” credit card reward points to travel for cheap.
Basically, I want to save and invest as much as possible until I have
“FU” money. Where if I lost my job, or I decided I hated my job and wanted to quit, it wouldn’t have a devastating impact on my life.
I’m all about “Financial Independence” but not as hung up on the “Retire Early” aspect.