volverse vs hacerse (become)
Both mean 'become' but for different kinds of change. Hacerse is chosen or earned. Volverse is a deep change that happens to you.
hacerse
Becoming something through effort, choice or gradual progress — professions, religions, rich, old.
Se hizo médico a los treinta.
He became a doctor at thirty.
A deliberate path. You work to become a profession.
Se hizo rico con una app.
He got rich off an app.
Result of effort or luck over time.
Me estoy haciendo mayor.
I'm getting old.
Gradual change over time.
volverse
Becoming something radically different, often unwanted — a lasting change in character or state.
Se volvió muy desconfiado.
He became very distrustful.
A change in personality that's hard to reverse. Usually after an experience.
El mundo se ha vuelto loco.
The world has gone mad.
Sweeping change of state. Volverse loco = go mad.
Se volvió insoportable.
She became unbearable.
Not a choice. She changed and the change stuck.
Tricky bit
The 'become' family: ponerse (temporary emotional or physical change), volverse (deep change), hacerse (effort or choice), quedarse (ending up in a state: quedarse calvo, quedarse ciego). Match the verb to how the change happened.