I compiled a list of active (or seemingly active) directories and lists you can share your site's feed

The BIG List of Neocities RSS Feeds
Requirements:
Send an email.
Host or link from Neocities.

Ye Olde Blogroll
Requirements:
Submit form.

ooh.directory
Requirements:
Submit form.

Minifeed
Requirements:
Submit form.

powRSS
Requirements:
Submit form.

indieblog
Requirements:
Submit form.

BlogDB
Requirements:
Submit Form.

feedle
Requirements:
Submit Form.

Blogarama
Requirements:
Create account (email verification).

Kagi Small Web
Requirements:
GitHub account (to create a pull request).

Bubbles
Requirements:
Send an email.

RSS Parrot
Requirements:
Mastodon account (to mention the bot).

A bit more info here: https://pirahxcx.neocities.org/computer-nerding#indexed03