Curly hair not so curly anymore

So I’ve always had curly hair and it would always form into nice curls after putting in my products

Within the last year or so I’ve noticed my hair does not curl the way it used to and is more frizzy. I recently switched my shampoo with a new one and got conditioner and a deep conditioner hoping it would help my hair return to the way it was.

I was just curious as to what made me loose my curls? I’ve haven’t dyed my hair at all I never use heat on it either.

I’ve been wearing my hair in a bun for the longest time now without bothering to put any products. Do you ladies think this could be the reason why?

I’ve recently been inspired to wear my curls out more often but was then disappointed to see they’re more like frizzy waves with some curl in sections😅