How do I keep building financial models that hold up and answer real questions?

You've reached the place many never do: your models are clean, they hold up, and they answer what people actually asked. That's worth pausing on. Skill like this is quiet and easy to take for granted, so name it plainly to yourself. The risk now isn't collapse, it's drift. Clean work can slowly get cluttered as you rush, reuse, and patch. The way you protect it is the same discipline that got you here: clear drivers, honest assumptions, and a willingness to throw out a tab that's gotten tangled rather than nurse it along. Keep one habit sharp. Before you send a model, ask yourself the one real question the reader has and check that your model answers it in a single, clear number. If it does, you're still doing the thing well. If it doesn't, you've caught the drift early.