The next two will be on the Constrained Directional Enhancement Filter and the Daala Entropy Coder, which AV1 adopted as it EC system. Beyond that, there will be several more though I've not yet planned out a specific order.
Can we somehow convince you to part-time more technical blogs and videos? Like others here said, you have a knack for writing really accessible technical articles without them feeling dumbed down.
I don't know if you're just more into doing the hands-on work of developing the codec (I can imagine that's exciting), or if it's a question of technically not being hired to do that.
In the latter case, maybe "The People" could vote with their wallet to convince the higher-ups otherwise?
Like, Ubuntu lets us decide what we want them to spend our donations on. If we had that with xiph.org and it had a section that said "more technical blogs!", or maybe even something like patreon a set-up where you can pledge to automated repeat donations for each blog entries, wouldn't be surprised if there were enough nerds willing to send donations specifically to justify to the managers that you may spend more time on outreach.