https://valheim-map.world is your friend! Load up this website and when you start a world, enter the seed into the dialog box for it on the site. Then you can choose what you want to show on that map to see if that's going to be a seed you like or not.

I'm convinced that many that say this game is "too hard" simply started on a "bad seed", and need to try again. You can choose to take your already skilled character (and items in your inventory) to the new seed, or choose to start a whole new char. It's up to you!

Happy Adventuring!