For me it's the following:
I want to improve my APL(Dyalog/co-dfns), Rust, and Coq skills to passible levels, i.e. being able to comfortably use them and writing code in an idiomatic style.
I also want to improve my skill with SystemVerilog and VHDL. I'm decent with HDLs but I need a lot of work with regard to my testbench writing, translating specs to a TB, and using the random constraints based testing(similar to property based testing in the SW world).
I'm trying to properly pick up C++ template meta-programming and improve my familiarity with minimal to zero cost abstractions w.r.t FP and HOF.
Outside of programming skills, I want to start learning some project management skills, i.e. feature breakdowns, timeline estimation, and the basics of when/how to pivot.
Finally, I'm trying to learn how to tell when I start falling into one of my biggest issue as a developer and how to curb it: getting stuck on an idea and overlooking better alternatives.
It's a bit to take on but I'm young and don't have too many commitments so I figured it shouldn't be too unachievable.