I feel like my hair has thinned out a lot. Can you recommend a scalp care ampoule?

Lately, I've been worried because the amount of hair that falls on the floor when I wash or dry my hair has increased significantly.
My hair used to be thick, voluminous, and strong, but now it's limp and my scalp feels much more sensitive.

I'm planning to start home care now before full-blown hair loss sets in.
I feel like shampoo alone has its limitations, so I'm looking into scalp care ampoules that can directly provide nutrients.

There are so many products on the market that I don't know which one to choose.

Has anyone tried a scalp care ampoule that absorbs quickly without being sticky and helps strengthen hair roots?
If there is a scalp care ampoule that reduces hair loss when applied consistently, please share it with me.