The guy on the primitive technology channel smelled iron from orange bacteria. He used 3 different methods with his most complex tools being stone and clay. Copper and tin are generally easier, and are exposed on the surface in many areas. The only thing stopping people from figuring out bronze earlier was location and luck. I think the bronze age starting 7000 years earlier would have had an impact.
I know how to make black powder, and generally know how to source it. Between that and bronze, you could have guns over 11000 years earlier than we did.
I've built houses.
I know the basics of making paper. Even if I didn't, clay tablets are easy. Writing 4000 years earlier would necessarily advance knowledge if nothing else happened. Throw in some math and the concept of zero and you could advance knowledge in those areas by thousands of years. Math isn't relevant? Some of the oldest structures we have around use math and astronomy. Imagine if we had those 5000 years earlier.
One of the bigger reasons people don't learn more languages is because they don't have the time or interest. One of the best ways to learn is immersion. Being in a situation where you have to learn a new language if you want to communicate with anyone else would certainly be a motivator to put in the effort.