I am currently about half-way into my novel. I have 6 books planned and this is the farthest I've ever gotten with a novel before. My usual writing style before was short stories and poetry. So this is a very new thing for me, spanning an entire world and story over so many books has been incredibly fun and not without its challenges.
Funnily enough, getting started was really easy. I created a world, drew a world-map, and then the story just flowed. I have everything plotted out (in pencil, I'm always up for revisions and being flexible with what works as I go). But now I am 50,000 words into the first book and I just feel as though I've ran out of steam. I'm trying really hard not to rush things (like my old short-story writing brain wants to do) but I'm struggling to know where to go now.
I'm unsure if it's best to go back trough everything and 'pad it out' to slow things down. Or to add even more side stories/side characters and events/world building that contribute to the flow of the story.
I'm open to any and all advice or ideas on this if you've also experienced something similar. I've noticed my writing has slowed down significantly because of this loss of steam and I don't want to fully lose momentum.
Edit: apologies, I don't think I was clear enough. I feel I've ran out of steam for this 1st book, the story for the next books is embedded into a much wider and complex world that is yet to unfold.