Do I need a better camera?

The Diagnosis

Here's the test: viewers judging your video 'low quality' are almost never reading resolution — they're reading light and depth. Flat, even lighting and a subject pressed against a bare wall read as amateur in 4K; shaped shadow and a layered frame read as premium off a phone. So run the upgrade order backwards from what viewers actually perceive: first light (a window plus a reflector is already three-point territory), then depth (stage foreground, subject, background), then lens behavior (distance and the phone's longer lens buy the compressed, separated look), and only then — after those stop being the constraint — the camera body. There's a strategy reason too: a better camera makes the same flat frame sharper, which means it renders your actual problems in higher fidelity. Craft is the upgrade. The camera is the reward for running out of craft to buy.