Lots of bitcoin and mining topics I'm excited to dig into:

Proof of work versus proof of stake
Transaction fee predictions
Block subsidy purpose
Long term security
Hashprice history
Supply audit follow-up
Data-usage audit
SegWit and Taproot adoption
Reorgs
Output value, spending amount
Velocity of outputs
Mempool competition
RBF and CPFP usage
Softforks
Tracking "blocks needed to close all open Lightning channels"