I'd say branch off from just spamming/DDoSing and get into psyops. You can cause a lot more damage that way.
Learn to infiltrate places, gain people's trust, and utilize said trust to do whatever you want. Worm your way into a site's moderation staff and go on a banning spree. Gain influence in a community and say something that'll split them in two and start a shitstorm. Look for the dumbest people on a site, encourage their behavior, and also encourage more of them to come in, slowly turning the site to shit and/or just giving people something to laugh at.
There's a lot you can do here. It's not only more destructive and more likely to send people into a rage, but it's also more fun since you've got more options in what you can do.