Do modpack authors have the right to redistribute this mod as an override jar, i.e. in Modrinth modpacks? Alternatively, would you like to release on Modrinth or GitHub?

Additional context: Curseforge does not allow downloading mods from curseforge for modrinth modpacks. So when your mod is not available for download elsewhere, the only option is to redistribute the mod's .jar file inside the modpack and move the files to the mods directory. Manually moving files like this in a modpack is called overriding.

Isn't it possible for Modrinth possible to download the mod via the CurseForge API?
Because all of my mods are allowed to be downloaded via the CurseForge API.

Used to, but curseforge stopped them from doing that. https://blog.modrinth.com/p/modpack-changes

I will create a project on modrinth (https://modrinth.com/mod/easier-sleeping), which is currently under review.
I have uploaded, versions of the mod for Minecraft 1.17.1, 1.18.2 and 1.19.4.
If you need a version for another version of Minecraft, please tell me.

The review is done, and the mod is now available on modrinth.
https://modrinth.com/mod/easier-sleeping
Have fun using it.

Thanks!