If your respawn is still back at base, you could change the current portal's name to something unique, die nearby where it won't be hard to retrieve (maybe jump off something nearby and die to fall damage), respawn at base, make a new portal with the name of the portal near your corpse. Bring nails with you to your corpse to make a new boat and continue your adventure.

Or make a new character, have it join your world and run to base to double-check the portals are as they need to be, or for it to make a new one.