Not going to go into spoiler territory (i think, there might be vague hints, but that'll be it) just a bit of a breakdown, and where i see things going potentially

Sat down and binge-watched the whole mini-series and re-watched the teaser episode. Was rather interesting and enjoyable. Lots of questions raised, and only a few answered. The mini-series stands up pretty well on it's own, and i could see the series ending with just that. Though from what I've been seeing, there's supposed to be another season. There's a quick teaser for a second season during the end credits i believe of the last episode. now that doesn't mean that there'll actually be a second season, it does hint that something else will come down the line at some point. Could be another mini-series, or an actual season (or more).

Now, if they do go onto do a full season, they're either going to have to bring in a new main character, and re-tread what they did in the mini-series, or else they could bring back the original main character, and explore more of the history, lore, and mysteries of the Infinity Train. Stuff like who built it, where it comes from, how it chooses those who board it, etc.... They could also have sub-plots where new characters show up who are on their own journey of self-discovery, just like the original main character. Personally, i think they'll go with the second option, as there's so much more they can do with the series, rather then going back through the same story again.

Then again, maybe it'd be best to leave things where they stand, the series told a story, if a bit rushed, and ended. Unanswered questions? yes, but do they need to actually be answered? not particularly....