Making a mod for Valheim requires programming knowledge and experience with the specific game engine and tools used by the game.

Here are the general steps you would need to follow to create a mod with the features you described:

1. Familiarize yourself with the game engine and tools used by Valheim. This may include learning how to use the game's scripting language, editor, and other relevant tools.

2. Determine how the game tracks player skill levels and death. You will need to find the relevant code and data structures in the game's code and understand how they work.

3. Create a new script or modify existing code to implement the threshold mechanic. You will need to write code that checks the player's skill level when they die, and sets the threshold based on the highest skill level they have achieved.

4. Implement a mechanism for tracking the threshold for each skill and for updating it when the player achieves a higher level.

5. Test the mod thoroughly to ensure that it works as intended and does not cause any unintended consequences or bugs.

Keep in mind that creating a mod can be a complex process, and requires a strong understanding of programming, game development, and the specific tools and engine used by Valheim. If you are not experienced with these things, you may want to seek assistance from someone who is, or consider using a pre-existing mod that provides similar functionality.
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