Humans went through a massive cultural and technological transition some 40,000 years ago into what’s called behavioural modernity. This was a transition into complex symbolic and abstract thinking which generated developments including music, tattooing and body painting, decorative artefacts, advanced stone blades, compound technological artefacts composed of multiple parts or features, more sophisticated clothing, etc.
By multiple features I mean things like a bone needle with an eye hole. Such things didn’t exist previously. We did have basic single piece clothing similar to blankets or ponchos with some simple weaving, but everything prior to 40k to 50k years ago was dramatically simpler than later periods.
These developments enabled the colonisation of previously uninhabitable climatic regions, allowing modern humans to finally spread out of Africa and conquer the planet.