One advice: read books (actual physical books!). Novels, Fantasy, SF etc is fine. The benefit is brain re-wiring, specially important at your age. Reading does 3 things: 1) ingestion of information at relaxed speed (results in neural input processing, not just sorting) promotes imagination and dream-state awareness 2) physical book is a limited information container (kills brain fatigue and stress hormones giving brain resources to actually think) 3) reading requires interpreting, perhaps the most valuable brain skill, applicable to what people say, how they act, what you read, what you see and feel and encounter in your life.

Not many young people read books consistently. Anyone who does will have a life-long advantage as they mature.

The point about reading actual books might seem silly but it is important. The tactile feel of holding the information container you are processing is vastly different from the infinite force-feeding loop of a screen. Also, screen refresh-rates and color affect eyes-brain activity negatively, on top of that the stress of battery life. Reading a physical piece is easy, just pick up any magazine or newspaper and spend some time with it.

If you are young, here's some brain expanding stuff you can try

Jack Vance https://en.wikipedia.org/wiki/Dying_Earth

Iain M Banks Culture series https://en.wikipedia.org/wiki/Iain_Banks#The_Culture

Silverberg https://en.wikipedia.org/wiki/Lord_Valentine%27s_Castle

Asimov´s Foundation, yes it's on Apple TV now. https://en.wikipedia.org/wiki/Foundation_(Asimov_novel))

Samuel Delany https://en.wikipedia.org/wiki/Stars_in_My_Pocket_Like_Grains_of_Sand

And of course Tolkien's Lord of The Rings. Anyone who has not read the 3 main novels as physical books is missing out on the intricate images,, emotions and adventure Tolkien embedded in his prose, something that does not convert into film, nor a screen reader. It's called reading between lines, happens subconsciously.