If you're comfortably linking turns on blue runs and starting to explore easy black diamonds, an intermediate board is likely the right fit. Most riders fall into this category after 3–5 seasons of regular riding.
Intermediate boards feature medium flex and hybrid camber profiles, which give you a nice middle ground—they're forgiving enough that small mistakes won't punish you, but responsive enough to handle faster speeds and more varied terrain. You'll notice they feel more stable and lively than a beginner board without being demanding.
The biggest sign you're ready to move up? Your beginner board starts feeling noodly or unstable at speed, like it can't keep up with you anymore. That said, don't rush it—stepping up too early to an advanced board will fight your progression. An intermediate board lets you explore the whole mountain while still building confidence.