Ok personally i don't "relocate" so much as i have outposts on Islands with useful resources with one central hub and a portal hut there in. That way you can collect all your resources in one place and easily move them around when needed. Make sure its on the coast though so you can easily transport ores home over the water.

Have at least one spare boat to keep at your base, always have a spare unused portal with a name you remember at main base, and bring materials for a portal to the new island.
Do not sleep on the new island until you have a portal down.

These two things will give you the best chance of not getting stranded, trust me you really don't want to get stranded lol