Is Bitcoin really a "must have"?

It's normal to hear or read people saying "You gotta have at least one Bitcoin on your portfolio or you're not gonna make it" but I think it's kinda hard to do this unless you're a millionaire.

My portfolio is built on DeFi altcoins like AVAX and LINK so... How could I integrate Bitcoin in here? I'm just starting in crypto and I don't want to waste all my savings on one project, which in my opinion, is just outdated and sluggish for today's standards.

So, if I were to add Bitcoin to my portfolio, how could I get extra profits out of it without just holding the coin?