How do I keep my marketing tools integrated without everything tangling?

You can manage the stack, but the integrations drift and the data flows knot up on you. Keeping many tools talking cleanly is genuinely hard, and the tangle is not proof you are bad at this. It is what happens to every stack that grows. Every tool you add is another connection that can break, and the mess grows faster than the tools do. The people who keep it clean are not smarter; they are stricter about what earns a place in the stack. Less to connect means less to untangle. Map where your data actually flows between tools, even roughly on paper. You will likely find one or two junctions causing most of the tangle. Fix those first. You cannot untangle everything, but you can find the knots that matter.