Gotta build the package, which you can do once with pnpm build, or watch your local development directory and rebuild when things change with pnpm watch.
Then gotta use it somewhere, which tends to be easiest in a project. I use pnpm link for this.
Run pnpm build
Decide what type of new version you're gonna publish and bump the version with npm version minor|major|patch
Run pnpm build && npm publish