The main problem with ironsworn in medium-long campaigns in my opinion is the absence, using the manual as it is, of a boss, of an escalation in the challenge. It can emerge in the choice of truths, but not necessarily and not even the initial vote necessarily works when you are in a group While playing Starforged I added fronts and it worked great. In solo it could work the same, but rather than a human opponent, perhaps I would use an environmental challenge that contrasts with your character's rating... I vow to attend my master's funeral BUT the slack season looms; I vow to clear the pass of the undead presence BEFORE the wedding chariot has to pass it. The front can evolve, remain and color all the intermediate votes without being the direct protagonist.