I want to try speedruning this game, but I can't find any guides. Can someone give me a few tips or link a guide?

I would like to see a category that the runner could choose his/her own mods, so choosing the mods will be a part of the challenge. Of course, there may be forbidden mods or guidelines for what mods are allowed (example: you can't use mods that let you reach the end faster (like getting blaze rods without going to the nether) or increasing the spawn/drop rates) and also changing the config files or using scripts should be forbidden, unless there will be another sub category that allow any of those things.

The new run will not change my place on the leaderboard so it seems unnecessary, but I readed that speedrun.com is holding the history of runs, so, should I submit the new run if I have a better one on the board already?