I would also talk to your company if you are thinking about coming back in a few years. They might be able to give you a few hours of work on an ad-hoc basis -- just enough to keep your clearance active while you are staying home, and/or sponsor your clearance while you do a little bit of work as an independent contractor. Your job today might be all or nothing, but they might be able to find something else that is more flexible. If they value you and want you to come back in the future, they might be able to find a way to do this, assuming it is allowed by security rules (and I don't know either way if it is).
I have also heard that your clearance can be easily reactivated within the two year period after you leave the company, but after that, you have to start from square one. I would lean toward doing whatever you can to keep it active. There's too potential difficulty to get back into that lucky spot where someone is willing to submit you for a clearance. Good luck.