The display, keyboard and outershell need to be replaced

Anything is fixable, but what you are proposing will require replacing everything but the logic board. It's up to you but personally speaking I would buy a new Mac.

Properly prepare the broken one for sale in accordance with Apple's instructions and sell the wreckage. You'll get at least a couple hundred bucks for the logic board. Refer to What to do before you sell, give away, trade in, or recycle your Mac - Apple Support. Take photos, describe it as accurately as possible, show its "hello" screen demonstrating it's been properly prepared, and accept a return should the purchaser request it. Devote the funds to a new M3 Mac and you'll get more than you would pursuing a repair for what is already an outdated one.

Look ok to me 😆

Do I need to mail it or take it to an Apple store in the US?

If you are not in the US I don't know, but start here: Official Apple Support. Apple will have a definitive answer for you. Let us know what they have to say.

Honestly, it’s going to cost more to repair than it would to buy a new one.

It had a good life. It’s time to let it go.