Portals, poison resistance mead, and bows/wood arrows will get you your gear back. May take a lot of kiting, but it'll be more satisfying if you do it yourself than if you enlist help. Graves don't expire. Your gear will be waiting for you. And remember dodge-rolling gives you a split second of invincibility.

Might take you a while on a raft to place the portal, but you'll make it so long as you place the portal in a meadows/forest near the swamp. And don't worry about anything that was in your boat, it'll still be there in crates.

If you can't find any crypts, look up the valheim world generator, plug in your seed, and it'll tell you where crypts spawn.