Some SBI fics I've read that I love and recommend:

A pretty long thread :D

Back in the Days of Our Youth by Pidgescarlet:
https://archiveofourown.org/works/29280894/chapters/71905149
Tommy drinks a potion that turns him back into an 8 yr old /dsmp

Extension by Jk_Kat:
https://archiveofourown.org/works/29931750/chapters/73673433
AU where Tommy is a young blind magic-user and gets adopted by the antarctic empire

Fed to the rules as I hit the ground running by your_beauty_shes_grace:
https://archiveofourown.org/works/28612002/chapters/70125654
AU where Tommy, the new prince of the antarctic empire gets kidnapped and raised by Dream Team

Peeps by MollyPollyKinz:
https://archiveofourown.org/works/28612002/chapters/70125654
Pre-DSMP AU where Tommy starts to imprint after he grows his wings. Very cute and has a lot of fluff

Wishes and Family by A_Non_ymousWriter:
https://archiveofourown.org/works/29139060/chapters/71536050
DSMP Magical Kids AU, one of my favorite fics lmao

An Intervention from the rulers of the antarctic empire by sircantus:
https://archiveofourown.org/works/28058304/chapters/68739945
Tommy gets rescued by Phil and Techno from his exile, overall a really cute and adorable fic awooga

Change fate by being aggressively kind by sircantus:
https://archiveofourown.org/works/28237845/chapters/69195987
AU where a prophecy says that 3 monsters will destroy the world when they grow up (Tommy, Wil, and Techno) and Phil basically tries to find them and raise them lmao its so cute ueueue

Tommyinnnit's unbeatable method of avoiding sudden death by Eneli:
https://archiveofourown.org/works/29230860/chapters/71774421
AU where Tommy is a vigilante and gets into all sorts of troubles and mishaps. Very funny, cute, and comforting hehe

I was a kid in the village doing alright then I became a prince overnight by sircantus:
https://archiveofourown.org/works/28045056/chapters/68705025
AU where Tommy gets into some trouble and meets Phil, king of the antarctic empire and oh boy Phil wants to adopt him

Lets Play a game by Aria_Cinabun:
https://archiveofourown.org/works/27677894/chapters/67732991
Elementalists AU where Tommy and Tubbo are Phil's lost biological kids, a pretty shocking and cool fic :D

Rest (Ghost AU) by LuminaStarCrest:
https://archiveofourown.org/works/27712975/chapters/67826743
Fic based off WolfytheWitch's Ghosty bois Inc AU

theres a lot more fics that im reading but I cant list them anymore bc this is getting so long. anyways, what Im saying is there's so many great fanfictions out there and I really think u should check them out more :D

I might update it later and add more fics I've read and loved