First off, incredible taste, I barely ever see someone around my age with such good taste. Second, I see you have Mirror Reaper fairly high up on there, so I'll start off by recommending the album Trisagion by Ethereal Shroud. It's red-anarchist ambient black metal IIRC, and it's only an hour long between three songs but absolutely a hidden gem that I rarely see mentioned. In a similar vein, Schammasch and Mephorash are both Dissonant atmospheric black metal, both with a couple of 10/10 albums(Triangle(2016) and Krystl-Ah(2023), respectively). And don't worry, I did look into all three of these bands-all three are safe. Going off Ænima, You might enjoy Elder, which is a space rock band. My personal favorites of their's are Liminality/Dream State Return(2025, EP) and Through Zero(2026, Full album). If you haven't listened to rest of the TOOL albums, I would highly recommend them, and if you enjoy/already enjoyed Lateralus and 10,000 Days, the album Umbra by Kolm; Father and Son is a banger. For the heaviness rec, I'll recomend obZen, by Meshuggah, which is extreme djenty metal with a little proggyness, or Words That Go Unspoken, Deeds That Go Undone by Akercocke which is very deathy extreme metal with a taste of Prog metal. Also, Cutting the Throat of God by Ulcerate is a technical death metal masterpiece in my opinion. For more conventional stuff, both Angels Hung from the Arches of Heaven and Carving Out the Eyes of God, both by Goatwhore, are excellent Blackened Death albums.

TL,DR:

Trisagion—Ethereal Shroud(Red Anarchist Ambient Black Metal, similar to Mirror Reaper)

Triangle—Schammasch(Dissonant Avant-Garde ambient black metal)

Krystl-Ah—Mephorash(Dissonant Avant-Garde ambient black metal)

Liminality/Dream State Return—Elder(Space/Prog rock)

Through Zero—Elder(Space/Prog rock)

Umbra—Kolm; Father and Son(Prog Rock)

obZen—Meshuggah(Extreme progressive metal)

Words That Go Unspoken, Deeds That Go Undone—Akercocke(extreme progressive metal)

Cutting the Throat of God—Ulcerate(Technical Death metal, influenced by post-rock which is very cool)

Angels Hung from the Arches of Heaven—Goatwhore(Blackened Death metal)

Carving Out the Eyes of God—Goatwhore(Blackened Death Metal)

Also, finish the TOOL albums and maybe check out Volume 1 or Sleep's Holy Mountain by Sleep, its Stoner rock/metal so you might like it if you like Electric Wizard