There's two things you can do.

If you have a dynamic public ip then you can set up a dynamic dns service that automatically changes DNS settings if you ip changes.

The other thing you can do it use a tunneling service. There are free tunnels available (like ngrok) but for nextcloud, you will need to get an external server can set up a tunnel with it.

Outsider <--> External Server with Public IP <--> Server inside your LAN

For this, you can create a ssh portforward. There's plenty tutorials online.

Inspired in part by recent dropbox changes I'm thinking of taking a small box I have laying around and turning it into a nextcloud server (it doesn't hurt that even without making a single upgrade I'd get a significant jump in drive space). Being on residential internet I don't have an IP address that's guaranteed to stay the same so what are the current options to be able to access it from by tablet or laptop when I'm away from home?

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