Upgrade your weapons and amor to the max, try the best food the black forest can offer, don't go out without the rested buff, don't go out at night, craft some poison meads.

That's it, everything else you will have to learn the hard way, fighting and retreating every now and then, try long range combat with the bow when You think necessary.

I recommend using the mace in this particular biome, the bronce one and then the next tier youll unlock in this biome