i want to do a speedrun to the nether but i dont have a mod there is no firge mods and i dont wanna go through the process of getting a mod without forge so can i use a data pack if so whichone

no

Multi instance?

Forge/Forge mods aren't allowed for speedrunning nor are datapacks

Datapack are not allowed, just get fabric it's not that hard

Fabric, and then newest speedrun igt version by redlime