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Practice …if you mean "how can I increase my IQ test score"

IQ tests are learnable – just like any multiple-choice test is learnable – so you can improve your score with practice

Conveniently, if you practice to do better on an IQ test, you are also improving your ability to do things IQ tests evaluate: spatial reasoning, pattern recognition/prediction, etc

Does improving those skills improve your "intelligence"? Most likely the answer is, "yes".

It's going to improve your mental diversity. To quote from Joel Spolsky (in a different context (hiring), but applicable herein):

people who come from enough of a different background than the existing team that they are likely to bring new ideas and new ways of thinking to the team and challenge any incipient groupthink that is likely to keep us boxed into our own echo-chamber way of thinking about things. When I say different background, I mean culturally, socially, and professionally

This also builds on Scott Adams' "talent stack" concept – the more ways you have to think about a situation, the more valuable you become: because you're bringing those techniques to bear in ways others may not