How do you all do home care for calluses?

I have been walking a lot for the past three years.

I wake up in the morning (with some exceptions) and walk around the neighborhood, reaching 10,000 steps almost every day.

I'm not sure if that's the reason...

While observing the feet, I noticed something...

My soles used to be a bit soft, but lately, should I say they've become quite hard?

It doesn't go in much when pressed, and it is somewhat hard and stiff.

Is this a natural result of walking?

My legs don't hurt or feel uncomfortable, though.

How should I take care of this foot at home?

I saw a post saying that applying Vaseline makes it a bit softer..

Should I do home care separately, such as massage or using ointments?

I am asking this because it feels very stiff.