I think you need to map more in general, what im seeing is just, not enough experience. You have lots of random flow, and rhythm changes that i would point out but I dont want to flood your map with mods. Now, you are on the right track i think, but as of now, there's too much of the same thing that happens that any visual suggestions/patterns might be too much to ask for. The mods i provided are a very barebones idea of what you want in your map as a base of fundamentals. Look at your favorite mappers and take some of their patterns and ideas and ask yourself (or them if they arent like sotarks) how they mapped it that way and why you like it. Good luck on your mapping journey ! :)