My friend you do not have to take my word for it as I'm sure a professional dermatologist will confirm what it is I am saying...
Trust me when I say I have EXTENSIVE knowledge and experience with what I am talking about, especially as it relates to diffuse thinning, considering I am a diffuse thinner myself...
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that picture that you posted right there tells you all you need to know....and I remember when I saw it with my own eyes on my own head of hair for the first time...you can see where the crown, the sides, and the hairline all appear strong but the thinning is occurring uniformly down the midscalp...trust me I have spent so many hours online doing my research for diffuse thinning cases, this is textbook imo
a keto based shampoo can help with the seb derm, i would not advise minoxidil in your situation because of your long hair making it difficult to apply and because minoxidil does not address the root cause of balding itself which is dht....
if you want to stop further loss based on the treatments we have today finasteride is your only realistic option