I will caution you that this advice works really well during a bull market when companies can afford to hire deeply knowledgeable specialists, but specialists can get absolutely wrecked during a bear market, as companies seek to trim the fat, restructure, or get swept away by the deluge of a recession entirely.

My advice to designers is, and has always been, general to specific.

Know the industry, know your strengths and weaknesses, and leverage JIT learning and implementation when you need to know something specific. Specialize where the money is going, not where it is right now, and only where/when you need to, because specializing in any one area of design (I prefer UI and visual myself), can become a massive liability when market liquidity dries up.

I've found a good approach to be investing in your skills in the same way you'd invest your money. Dividing each into a cross-sectioned portfolio of knowledge that is weighted for growth or dividends, depending upon your specific needs and projections.

As an example, traditional UI will probably get nailed by AI within the next 10 years, so both myself and others who like working with UI will need to pivot to AR/VR UI that hasn't been throughly patterned yet, and reintegrate that with current skills.

Ultimately, it is the designers who can do it better, faster, or cheaper that will survive the next recession, and I have found with alarming regularity part of that is begrudgingly accepting the need to be a "generalizing specialist."