1. How to get more Piece of the Forest's Soul, Strong Bark, and Fern Flower
Upgrade your Dark Thicket! Doing so increases the chance of these resources dropping when you interact with objects on the location.
   

2. Workers on the location
Some workers available on the location can assist you, but their availability varies. One worker might be able to help continuously, while another only for 1 hour. Make sure to check their timers carefully.
   
   

3. How to get Forest Dew
If the Herbalist's Table is not yet unlocked for you, you can still collect Forest Dew from objects around the location, such as trees, snags, and grass.
   

4. How to get Hard Bark
To unlock Hard Bark, continue progressing through the story quests. Soon, this resource will become available for collection.