A few years ago, I started a solo-play of the Iron Gods adventure path. I've let it sit fallow for a while, but given the lockdown I'm looking at reviving it.

You can find a Trello board with information here. It has some useful background information and documents I'm using.

If you're curious how I'm running a solo game, the meat of the answer is in the last page of the House Rules document that can be found on the Useful Documents card in the Trello board. Long and short, I make characters and then begin writing how they react to situations, and I use dice to answer directed yes-or-no questions if there's some uncertainty about how they should react. It's pretty elegant, and gives me an excuse to roll d12s more often to boot.