Sure some mods can make the game easier but there's also bunch of mods that make it more difficult than vanilla version. There's so many options it's definitely worth a try if you got over the vanilla and want some QoL improvements, different twist to mobs, gear and loot. Valheim+ is a good start and it's mostly QoL unless you mess with numbers.

If you haven't played through the game without mods yet, i'd say play that way first. You will appreciate mods additions way more later and you'll get the feel for the real difficulty of the game.