That free time you have is a luxury if you are working. It can still be very enjoyable to do interesting things after work, but I wouldn't look at them as investing time or learning new skills or hustling (i.e. working). That's a great way to get burnout. Burnout can be horrible if you never have leisure, but you can still make some that off time productive in some way without it feeling like work. For myself I like to put together projects in new tech that seem interesting for an idea that is absurd. It doesn't have to be even a full demo, just some examples where you poked at something and can talk about to coworkers. Arduino / Raspberry Pis are great too - super easy to get in to and you can make stupid fun little trick things. Same with chat bots and cloud infrastructure - slap something together and everybody can have fun.
I'm just wanting to say be careful how you look at your free time. That relaxation with video games and a beer is OK. But if you're wanting more out of it then turn it in to some way to get conversations and cool hacks working with coworkers or friends. Also - try switching up some video games with board games. There are some incredible board games out there these days and it'll be easy to get a group together at work for a quick round of some games.