If this already exists, why not link to a place to improve under resources?
For example, the Hard Drop community is dedicated to all variants of tetris, and make up a large percentage of the jstris playerbase. Why not send some of the people submitting here to a place where they can hone their skills?
Under, say, guides or resources would be a good place to put this.
discord.gg/harddrop
New leaderboard rule
Here is a preliminary draft of a new global leaderboard rule:
Every submitted run has to be tied to a Jstris account. This account either has to be named similarly to the one on speedrun.com or have the speedrun.com name be permanently displayed in the "About player" section of the Jstris account.
Giocate recenti
