Isotope shifts among different isotopes can be effectively addressed using narrow-linewidth lasers, facilitating laser isotope separation and achieving significant enrichment at a single stage. The separation of potassium isotopes, employing optical pumping and magnetic deflection, has proven to be efficient. To further improve the enrichment of ⁴⁰K, we introduce 2D transverse cooling to minimize the divergence angle. Through this modification, we demonstrate enrichment of ⁴⁰K, elevating it from 0.012% to 12%-20%. This represents an enrichment increase by three orders of magnitude, surpassing our previous result by one order. Our method is particularly well-suited for isotope enrichment of elements with extremely low abundance.