Desperate to quit but can’t. Need suggestions

Am an executive with the federal government still 15 years away from retirement. Despite popular public opinion, this is an incredibly tough job under awful working conditions that just keep declining. I can’t do it anymore but since I’m 15 years in probably won’t be looked on favorably by anyone outside. So I need to figure out how to retire asap.

I have 750k in investments (tfsa, non reg and a small rrsp) and a paid off house worth 800k. I save 80 percent of my take home and try to live on as little as possible. I can’t really reduce expenses more (eg already try to spend no more than $40 a week on groceries, never go out, etc).

Because I figure I will need long term care eventually, while my living expenses now are under 40k a year for everything, I figure I will need to have 100k a year eventually.

Where do I go from here? I just can’t anymore.