Learn the fundamentals until pressure cannot make them disappear.

Under pressure, the sophisticated parts of your skill disappear first and you fall back to whatever is deepest. If the fundamentals are shaky, there is nothing to fall back to, which is why people perform far below their ability in exactly the moments that matter. Depth in the basics is what makes everything above them usable when it counts.

Spend some of your practice time on basics you consider beneath you. That is what remains available when everything else stops working.