A growth mindset develops through repeated action, not through deciding to think differently. You build it by treating setbacks as information and by practising specific responses until they become your default.
The mechanism is simple: every time you respond to difficulty with a next step instead of a verdict about your ability, you reinforce that response. Do it enough times and it stops feeling like effort.
This article covers whether the approach actually works, how it compares to relying on fixed beliefs about ability, who it suits, and how to adapt it to a full calendar.