Hello :)
Where is the fun in playing this game without the possibility of dying (ingame) while doing so?

But here is a little bit of help for you (i dont know if there are mods that would have the same effect, sorry):
You can enable "godmode" via console.

Here's how to activate the console:
Right-click Valheim in your Steam library.
Select Properties.
In the General tab, look for the Launch Options field.
In it, type "-console" (without quotation marks!).
Close the General tab.

After you have done that, press F5 ingame (that will open the ingame console) and enter "god" (for godmode) and maybe "ghost" (for ghostmode so the enemies wont notice you at all).

MFG

CKTMC