I want to speedrun in 1.16.1 if this affect mods I'm using Fabric Loader with these mods :

• atum
• fast reset
• lazydfu
• lithium
• sodium
• speedrunIGT
• starlight

Fast reset might no be allowed but lets see what a moderator says

seems fine, but please consider adding WorldPreview and LazyStronghold, they increase resets drastically fast reset is allowed yeah

Yeah didn’t doypingu do that one wr for 1.15 that couldn’t be placed because he used starlight?

Nope. Starlight is allowed. Here's a list of approved mods: https://redlime.github.io/MCSRMods/?version=1.16

There's also a tool called ModCheck which can make it so you have all the legal up-to-date mods. https://github.com/RedLime/ModCheck