I think this is one of those times when a beta reader and/or editor can be a help. A lot of my stories have been written without them and they have turned out to be good stories that in many cases are poorly written. For my latest story, I accepted the offer of an editor/beta reader who has been invaluable. When I've sent them drafts of chapters the feedback, helpful hints, tips and suggestions have helped to improve the flow and continuity, when I've been stuck on how to continue they have been supportive and kept me on track. As a result, some scenes have been fleshed out, and others have been cut back by using alternative words and/or phraseology. The result has been far less lagging and better pacing. I'm not saying this is the answer, but it has helped and worked for me so I'm sure it can work for others too. The key to the way this has worked for me is that my editor/beta reader is as invested in the story as I am and has a good understanding of me and the story I am writing and the direction that I want it to go. I hope this helps and I'd love to read what works for others.