Does hair quality deteriorate as hair loss progresses?

I previously inquired about hair loss management related to dieting.

My hair is the problem again this time.

Maybe it's because of the diet, but hair loss is a problem, but

Overall, my hair has become dry and brittle.

The thing I'm most worried about is

The ends of my hair are splitting and breaking.

I can't cut everything out.

I want to start managing it now.

My hair length is about chest level.

That phenomenon gets worse towards the ends of my hair.

Of course, it would be good to cut off the damaged parts, but

I think it would become too short if that happened.

What can be managed in this state Is there any way to do this?

The hair products are good, and the clinic treatment you saw results from is

If you have any recommendations, please let me know.