How do you stay updated with programming languages and technologies you’ve learned?

I'm curious about how you all keep your skills sharp in the various technologies and programming languages you've learned. I've been working as a software developer for six years, starting with frontend work and then moving to backend technologies. I initially used Angular before switching to Go, PostgreSQL, Docker, and Kubernetes over the last few years. Recently, I was assigned to a project primarily involving Python and now C++. Since all this has been with the same company, I'm thinking about looking for a new job, ideally in a medior/senior Go position, since that's where my most experience lies. But here's the kicker—I haven't touched Go for the past year, and I'm concerned about my interview prospects. I've forgotten a lot of the syntax, and I don't feel confident coding in it on the spot. The same goes for technologies like PostgreSQL and Kubernetes that I haven't used in a while. I get that problem-solving skills and foundational knowledge are key, but it feels like I could just apply for a Java position instead since it feels easier to learn on the fly. So, how do you keep your knowledge up to date during times when you're not actively using certain technologies? It seems challenging to juggle it all, especially if I want to delve into newer technologies as well. It's a bit disheartening to still have skills listed on LinkedIn that I haven't utilized in years, like Angular, for example.