Pretty much anything from Birdy. My specific recommendations are the Fire Within album and the Beautiful Lies album.
I highly recommend King Crimson's Epitaph. I know you said you don't like rock, but this is pretty chilled out rock. Bear in mind, it's like nine minutes long, but it's 100% worth imo.
Rnla & Julia Alexa - like everybody else Kina, ft. Snow - get you the moon SYML - Where's My Love (personal favourite for relaxing instrumental and vocals) Fells, ft. Olivia Ray - Stuck Like Glue Eminem, ft. Dido - Stan (I know you don't like rap but this is a classic, Dido does a great job on it) PETIT BISCUIT - Night Trouble (this has been a great relax song long before TikTok ruined it) Lea Michele - Run to You Lost Kings, ft. Jordan Shaw - I Miss The Future San Holo - wheels up Emmit Fenn - Where I Went Wrong Forester - Symphony Illenium, Jon Bellion - Good Things Fall Apart Radical Face - Welcome Home (again, great song that got ruined by Tik Tok) Sasha Sloan - Dancing With Your Ghost Quinn XCII - U & Us X Ambassadors - Renegades (absolute classic) Green Day - 21 Guns Green Day - Wake Me up When September Ends Lana Del Rey - Summertime Sadness Illenium, X Ambassadors - In Your Arms Tove Lo - Habits Matoma & Gia - Heart Won't Forget Tatum Lynn Cover of Cranberries - Zombie (this cover is more relaxing and instrumental as opposed to the original) Majority of these go along with the softer and more laid back vibe, lemme know if you want more or others in different genres
Horse The Band - Birdo Gospel - As Far as You Can Throw Me I Would Set Myself on Fire For You - Nine envy - Scene Saetia - The Sweetness and the Light Mid-Air Thief - Why? Sorority Noise - Using Mereba - Sandstorm Joyce Manor - Constant Headache Origami Angel - Constant Headache The Frights - Kids Wavves - My Head Hurts Jack White - What's the Trick? Microwave - But Not Often Mild Orange - Stranger