Just a few suggestions for legacy
Make birth happen more often. Its really hard to get people to do things when you dont have people. Maybe just do a little more or make more babies be born the more adults.
2. Faster fast forward
Make another fast forward thats like 100x or maybe even one thats 1000x. This would make the game less waiting for people to grow up.
3. More/better policies
I dont know what could be added but i dont find some of the policies useful (most of the food ones). If you read the tutorial it would say "start with some gatherers" and if you have those youre likely to be fine with food. Im not saying remove them but maybe get some better policies or more policies.