The classic Homo Universalis wasn't just skilled in various field, they innovated in various fields, and with the highly specialized fields these days, that's hard to do. At least in science. Stuff like art, politics etc is arguably easier.
The only modern scientist I can think of who comes close, is Noam Chomsky, who revolutionized linguistics and pioneered formalized grammar, and I encountered his work in AI, psychology, linguistics and theoretical computer science (formal languages). On top of that, he's an influential political thinker.
This obviously isn't something you can do in 5 years; it takes a lifetime. You'd have to go deep into whatever science most appeals to you or you have the most talent for, find something truly new to do here, without losing your interest in other fields.
But if you simply want broad knowledge, just expand in whatever fields interests you. Science, history and art are all interesting fields in this respect.