Valheim+ is the first one I would recommend because it has the most options. You can change just about any number variable in the game, and it includes a lot of quality of life options as well. You need to alter a text file to customize it, but it tells you exactly what to do. I also use Farmgrid to make planting easier and Dodge On Double Tap.

There are others in there that make bigger changes to the game, like adding magic, better loot, and boat building, but I haven't tried those.