You need more farming tech to get access to better food sources.
Since you are running out of berries quickly, don't do ANYTHING else but research. No building, no breeding. Use the time you have left before your child ages to pick mushrooms if you can. Have a villager or two forage if berries reappear, but that won't last long -- back to the research table!
Don't worry about getting "master" level villagers -- that will come with time anyway, since villagers become masters by doing things.
For now, change all your villagers' preferred skills to Research, and buy Farming 2 as soon as you can. In future games, best to avoid spending lots of time building until you have Farming 2 -- you'll have time to build once you have enough food.
Don't get frustrated yet -- the game is supposed to take a while, so don't rush...it's more fun that way, imho

-- jen