Most of answers don't actually hit right button:
If you don't mind to leave sub stand property and bring them up to today standard during your stay. Then sell your home now if your home make a lot of equality.
you only entitle 500K without paying tax if it is your primary home. so why not take such advantage.
It seems like you love doing a lot DIY stuffs.
We call this homeowner flipper.
Give us a call and I also can show you what you can do. because we do this too much.