90% of my friends are musicians so boy do I have recs for you!! All of these musicians are so talented and worth your curiosity. You're going to have the nichest recommendations when your friends ask you what you've been listening to recently.
I tried to hyperlink each artist but it's not working so I made a playlist instead. I'm realising now writing this there's kind of two vibes here, a kind of post rock/grunge one and a chill guitar indie one.
Mouse Teeth (you already know mouse), genre-blending poetic goodness. FFO: Mitski, PJ Harvey
The People Assembly, krautrock/post-rock chaos, best live shows, FFO: Fugazi, Shellac
Sister Bliss, a Transatlantic Leicester/New York collaboration, FFO: Mac Demarco, Beach Fossils
Hex Poseur, garage rock/grunge/punk goodness, FFO: Bikini Kill, White Stripes
Earls, Birmingham punk (no longer playing 💔 but the singer is now in Mouse Teeth's band, drummer is in Gudness and other two are in Fruit), FFO: Idles, Bob Vylan
National Opera, indie electronica dance pop, FFO: LCD Soundsytem, Metronomy
Dad Jokes, feel good indie, FFO: Alvvays, MJ Lenderman
Heart Sauce, summery synthy guitar indie, FFO: Hard Life, Faye Webster
CJ Pandit, indie singer/songwriter, FFO: Billie Martin, Willie J Healey
Dum Language, guitar indie rock who's sharpied name you will see everywhere, FFO: Kagoule, Palma Violets
Dusker, mathy post-punk, FFO: Protomartyr, Polvo
Sun Dog, shouty garage, FFO: Tropical Fuck Storm, Gilla Band
Chief Springs, harmonic indie folk rock, FFO: Big Thief, The National
Courtney Askey, gothic folk/grunge singer songwriter, ME lol, FFO: Nick Cave, PJ Harvey