I'd consider a sequel, but I wouldn't just continue on in the same comic with no break. The end of Errant is going to be very final in a lot of ways. Anything coming directly after would have to undermine the power of the ending or be really comparatively boring in stakes and action.
If I did a sequel, it'd probably be after a timeskip of a few years, the same characters would be in it, but after the timeskip, they'd have new circumstances and relationship dynamics to explore. The main protagonist almost certainly wouldn't be Rekki. There would be a totally new antagonist and conflict.