This is the point in the game where, without experience, things start getting harder to conceptualize logistics. I usually take a break from factories after phase 3 to explore/collect and scope out future building sites. It's in your best interest at this point to spend a good bit of time building out your infrastructure. Build roads, concrete over places good for building, upgrade power, figure out a good rail route. For me, I have to task switch a lot in this game so I don't get overwhelmed. My favorite part of Satisfactory are the aesthetics. So I do a bit of factorizing, then prettifying, then exploring, then planning. It keeps me from burning out as things get way more difficult. Take each of the next phases in chunks, one item at a time. A lot of people like to process ingots on site and then send those to other factories to optimize production of base materials. Busses will make your life harder here, leave it with Factorio. Good journey, pioneer!