First of all, this isn't about "which hosting site is better/should be used". Please don't discuss that here.
Now, the "Get Mods" button on both the KSP Forums and in-game menu redirect you to Curseforge.
However, many mods are hosted in other websites instead of that one, and if the player is new he might miss out on a lot of stuff because of these mods not being hosted there.
So what I suggest is, instead of having the "Get Mods" buttons redirect you to Curseforge, make it so it redirects you to the "Add-on Releases" subforums."
That would avoid such new players missing out so many mods. The mod featured in the last Modding Monday, for instance, was only hosted in GitHub. If a new player only saw the Curseforge site, he'd miss out on it.
I think it would also encourage these players to register on the forums. I, for instance, played for a meaningful time without knowing about the forums.
But yeah, that's basically it. I don't think it would be hard to do, the hardest part would be replacing the links.