wood is being harvested from the rare few trees found in the grasslands and has become a valuable bartering commodity between groups as it is vital in making tools.
the best way to create stronger weapons and tools would be to look for deposites of sharp and strong stones like flint. small omnivorous rodents, that are commonly found near your dwellings exist, and are quite ratlike if you want to do anything with them. your people have been surviving off fish and other oceanic creatures for thousands of years, and they are continuing to do that.
Kolinski: some of your population are migrating across the coastline, expanding your territory. channels are being dug from nearby lakes to form more mud, which is being used to insulate living places. small mud and dirt huts are being built by the sea, out of reach from the waves. and habitable caves are being turned into places of habitation. more complex wooden fishing spears, using backwards pointing barbs of carved wood to stick into fish and possibly land animals, have been create.
also this wide has a discord server, which has some useful things on it: https://discord.gg/BtpD4CJf