Just a techie guy running feddit.online to allow people to communicate, make friends and acquaintances. Odd coming from a happy introvert, right? (https://jerry.hear-me.blog/about)
I also own these publicly available applications:Mastodon: https://hear-me.social/Alternative Mastodon UI: https://phanpy.hear-me.social/Peertube: https://my-sunshine.video/Friendica: https://my-place.social/Matrix: https://element.secure-channel.net/XMPP/Jabber: https://between-us.online/Bluesky PDS: https://blue-ocean.social/ (jerry.blue-ocean.social) Mobilizon (Facebook Events Alt): https://my-group.events/and more...

One option is to switch to a PieFed instance running V 1.3.6. The devs did something about this for PieFed users that should help.
v1.3.6Stop floods of spammy posts from very new accounts on lemmy.world.New accounts (< 24h old) from lemmy.world are now limited to 3 posts in their first day.
V1.3.3Automatically delete posts by very young accounts that self-delete.
piefed.social and feddit.online are two that are running the latest code. I'm sure there are others.
Yeah, that person is quite annoying.