Export
If you've finished creating your modpack, you're able to export it using the ./pax export command. This will create a .zip file in an .out/ directory in your project folder. (You can also specify a custom output path with ./pax export <path>.)
The simplest method of getting your creation out to the masses is to publish your .zip file on Curseforge - The majority of modded players use a launcher that supports downloading modpacks from Curseforge natively. Of course, if you want to only make your modpack available to your friends and family, you can also upload it on any other file hosting service.