You know what makes a significant difference to your off-road riding experience? It's not an expensive frame upgrade, going from aluminium to carbon. Or even the same, applied to wheelsets: changing from alloy to composite rims.
The component upgrade that is easiest, cheapest, and most
influential remains your tyres.
Great tyres don’t cost more than terrible tyres. And in absolute terms, a great set of tyres is a lot cheaper than virtually any other component upgrades you are likely to make on your bike. And good tyres are transformative for your riding experience.