;-)
One advantage the Neanderthals had over us is they probably always had an abundance of game. With modern hunting gear the game will all be gone within months. Fishing too unless you can fish the sea. Agriculture is probably the way to go enough to live on doesn’ take much land but if you want to sell food that is a different story.
My Father in law is an agronomist. He once told me that a family of 10 can survive on 40 acres just fine if it is good land but they will not have much else. but will live.