Part 1 in 5 episodes, not part 5
What's coming of part 1 has a bunch of slower stuff, so I'd say maybe not five episodes total for part 1 but at least 6, probably 7, at most 8 episodes total (so 3 or 4 more). Still, we're definitely getting part 2 and we'll have a lot of room to fit it in 2 seasons.
If I struggled to the end of my determination, to the end of my way of life with my followers, if the result is ruin, then this ruin is inevitable. Grieve. Shed tears. But you cannot regret.