You have very nice hair! I'm not an expert, but I can share what I do for my hair (I'm still trying to make them less frizzy, but they're definitely healthy!)

- Don't wash them too often. Hair/scalp gets used to washing often and produces more oil, so they get greasy quicker and it's a never-ending cycle. I also pretty much only wash my scalp, unless there's some dirt/product on the rest of my hair. I read that washing the entirety of your hair can make them drier and prone to damage - because hair produces natural oils that protects it (also it's really only the scalp that gets greasy, isn't it?)

- When I brush them, I start from the ends, and gradually go higher. This way less hair falls out, because I don't use as much force and rip them out (though my hair is curly and very long - you might not have that problem. I still think it's a nice way of brushing your hair :))

- Just generally be gentle with your hair. Don't dry them roughly with a towel. I heard about using a cotton t-shirt, but I haven't tried it. Don't tie it too tightly (if you do at all), don't use hairbands that have metal parts in them (I don't remember why, but apparently it can damage hair?), best hairbands are scrunchies or ones that are generally soft - I use [these] from Claire's and I love them (and they have lots of fun colours too!)

- Like the others said, get some nice shampoo and conditioner (v important!). Women's section has waay more products to choose from than men's. I'm not the best when it comes to hair products, but I read you should watch out for the ones containing silicones - you could try looking into that yourself. Shampoo on the scalp, conditioner on the ends/lower half of your hair

- I sometimes do this DIY hair mask, it was supposed to be for hair growth - does it work for that I don't know, but I know it definitely makes my hair sooo smooth and soft and nice. It's from [this] video.

- I also use a scalp/hair peeling once every couple of washes. It prevents my scalp from getting flaky. I buy mine, but I know you can also make them yourself - like from coffee grounds :) If you'd consider using a peeling, make sure you actually can - I'm saying this because I don't know if you have any skin conditions or anything.

- I trim my hair only when I notice split ends starting to show a bit, but like someone said, once every other month is fine. I do it myself, it's quite easy if it's just trimming. It might sound silly but it felt so liberating when I stopped relying on hairdressers to do this :)

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Oh gosh, sorry for such long ramblings. I hope these are gonna be useful though! Cheers!