I remember when BTC was $60-65K and my friend was buying more

Seemed smart/reasonable.

I said I'd wait. It dropped to $40-48K ish, and then I bought. That was reasonable, too.

Now when it's back to those levels, though, very few people seem interested in buying.

The psychological aspects of investing are quite interesting. If it came from a higher price, it's a bargain. If it came from lower, it's too expensive.

I wish I'd bought more at $30-40K but am still buying bits here and there.