C++ 20 Fitness retraining

I designed several systems in C++ years ago, mostly using Modern C++ (11/14). However, I’ve spent the last few years working heavily with Solidity/TypeScript/Node, and I feel like I’ve lost some of my “mental fitness” when it comes to C++ programming.

I want to return to the field, and I definitely need to re-skill to get sharp again—especially with C++20. I’m re-reading Effective Modern C++ by Meyers as a refresher, and it’s helping, but now I want to move forward into C++20.

What resources would you recommend? I found getcracked.io, which has a lot of C++20-style problems—does anyone know if it’s good?

As a side note, I have this strange feeling that many of us in our generation (I’m 46) were exposed to so much OOP that it’s sometimes hard to think outside the OOP box when modeling problems. It feels like it’s glued into your mind. I think OOP was great, but sometimes it feels like it went too far.
Do any of you feel the same way?

Thanks in advance.

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