In case anybody missed it, Frederik actually has quite a bit of content beyond Down the Rabbit Hole. The Warrens is a quasi-spinoff where he and his buddy Jabroni Mike take a more lighthearted look at weird shit that wouldn't fit the format of Down the Rabbit Hole:
https://youtube.com/watch?v=ZYR0C6b2pC4https://youtube.com/watch?v=jIfA1PQRIiQhttps://youtube.com/watch?v=t7PLRddEJH0If you didn't like those then you might as well stop here, because the rest of these are all just him and Jabroni Mike riffing on other types of weird shit.
How to Life on wikiHow is actually somewhat unique in that they don't just make fun of the pictures, they dig into the profound autism of the articles as well. I don't remember which episode it's in, but one of the articles they cover in the series is "How to Make a Lawn Gnome That Looks Like Your Partner." If that doesn't sell you then I don't know what will:
https://youtube.com/watch?v=ad2p8Wm_eao
Jabroni Reads is a series where they read through legendary sperg tomes like The Eye of Argon (and make fun of them, naturally):
https://youtube.com/watch?v=hGWhFxJb0SM
That Bootleg Show is a series where they look at ghetto-ass bootleg toys and other knockoff products. I'm linking Episode 3 because Frederik wasn't on the first two:
https://youtube.com/watch?v=2G-U8M228tw
They've done several other one-offs and may even have some series I didn't cover, but you get the point. Serious documentary boy also does funny podcast/stream boy stuff where he makes fun of weird shit with his buddy. Give them a shot if you need more weird shit to laugh at.