This post has a bunch of unordered youtube videos with music I love
A few themes: strong piano leads, polyrhythms, Japanese influence, OSTs, beautiful singing
Some of them are niche (~1-10K YT views) so hopefully you find something new you like!

Logical Emotion: トライアングルどら息息子

Dimash Qudaibergen: SOS d’un terrien en détresse (Piet Arion Cover)

Polyphia: Playing God

Boa: Duvet [Serial Experiments Lain] (Extended)

Kevin Penkin: Hanezeve Caradhina [Made in Abyss OST] (Takeshi Saitou Cover)

Deemo: Marigold (ふぃくしのん / phyxinon cover)

Nobuo Uematsu [FFXIV OST]: Great Gubal Library (Hard) Theme

Masayoshi Soken [FFXIV Endwalker OST]: Piano Covers by SLSMusic

Tosin Abasi: Thump

Keiichi Okabe [Nier Automata OST]: 壊レタ世界ノ歌 / Weight of the World

Shibayan Records: Fall in The Dark

Xi: Anima

Clowncore: Computers

Animals as Leaders: Behaving Badly

Coprofago: Motion

Gojira: The Art of Dying

狼と香辛料 (Spice and Wolf: 旅の途中 (OP)

Bobby Jarzombek: Selected Drum Solos

Infected Mushroom: Dancing With Kadafi

Ashleigh Bridges (OSRS OST): Coil

ダンベル何キロ持てる?: お願いマッスル (OP)

Meshuggah: New Millennium Cyanide Christ

Keiichi Okabo (NieR Automata OST): 遊園施設 (Amusement Park)

Iconoclasm: perditus†paradisus

Nobuo Uematsu [FFXIV OST]: The Lost City of Amdapor (Hard) Theme

Uneven Structure: Awe

Shiho Fujii, Atsuko Asahi, Ryo Nagamatsu, Yasuaki Iwata [Mario Kart 8 OST]: Dolphin Shoals


Indricothere: III

Nekomimi Syndrome: Fur War, Pur War

All That Remains: Six

An: Sadistic Confusion

Andy James: Burn it Down

Kevin Penkin (Made in Abyss S2 OST): VOH ft. Takeshi Saito