I'll start!
For me, it's all about horticulture (trimming, replanting and vacuuming) this year. I want to keep up with the trimming to avoid some of the algae battles that I self-inflicted on myself.
When I'm busy (or lazy), I end up just doing a heavy trim with a quick water change. This undoubtedly puts the plants into a growth slow down that allows algae (usually cladophora) to thrive. I end up beating it back and cruising until my next lazy moment.
I also want to nail down by fertilization automation. At the moment, it requires a lot of input from me. I need to find the exact dosing sweet spot for my tank and then automated using my DOS and Apex.
How about you?