Here is a summary of my PotD solo run so far. I am at level 16 now, and in theory I could go and finish the game off and get Triple Crown Solo achievement, but I still on track for Frozen Crown Solo and Ultimate achievements. I wish the experience cap was higher. I feel like I still have almost half of the game left, and the level is already maxed out. What's still outstanding for the Ultimate Achievement. the last 3 bounties from Caed Nua, Durgan Battery to finish off White March, White March 2, Siege of Craighold, Battle for Caed Nua keep, Od Nua fight, Adra Dragon, Sky Dragon. My stats without items are Might - 7, Con - 3, and the rest of them are 17. I put most of my skill points into Stealth and Mechanics. Skills: Fast Runner, Deep Wounds, Escape, Shadowing Beyond, Sap, Finishing Blow, Mental Fortress, Marksman, Gunner, Shot On The Run. I do have enough coin to retrain my character, and I might do so before the big final fights.
I didn't skimp on rests on this run, so I always have some kind of stronghold bonus going on. Also, I didn't try to minimize the number of kills, even though I did not try to wipe out every single enemy group. Some groups can be pitted against each other. Set off spiders and beetles onto the looters bunch on the first level of Caed Nua and was able to open both entrances to Maervald's room. Then got spiders and beetles to kill him and his blights for me. Shadowing Beyond and Escape was especially useful for this. In Elmshore, lions attack all humans, so I got them to kill of druids, knights of crucible (I sided with Dozens for the hearings), and later the leaden key people at the exit. Same with the cook's quest from Gilded Vale - got the wolves near the entrance to attack the bandits for me. For bounties in closed quarters I used dominate ability on my Ring Of Changing Heart to thin out the groups and prevent them from following me to the exit. Usually had to rest a couple of times before the group size got manageable. For some bounties in larger spaces, I was able to lure the leader away from the group, and avoided fighting the rest of them. In Raedric's Hold, I pretended that I am siding with Raedric, then sneaked away and killed off his group one at a time from the distance. In Northweald, animals can be pitted against primordials, so I used that to thin out the groups and get them away from their starting points, so I could get to quest locations.
I think this is about it for now.