I have also defeated all bosses and am building a base in the plains at a very good location. Mistlands, swamp, mountain, BF are all nearby and there is an ashlands on the same island a bit further as well. I'm not going into now it as that would ruin the generation if an update comes.

I am building my base with devcommands though, and am planning to compensate for it by playing on hard and/or doing a no portal run if I can convince my friends.