I think the trick to staying happy in cyber security is to chase down niche fields in technology. Your work won't be perceived as sexy by the broader community since you're not tracking north korea, but the trade off is that you will have fun and not have to brush shoulders with so many egos. So what's green these days? That's for you to decide, but one area I think is interesting is smart contract security on blockchains. Lots of folks are pouring into that space.