Rick Ferri literally wrote the book on Asset Allocation...
REITs and SCV are common "tilts" that people recommend here. People need to understand that when tilting your portfolio, you still need to adhere to the Boglehead approach of "stay the course" because there can be years of under-performance before the allocation shows it's benefit.
With that said, why not ask the man himself? u/Important-Builder370
Since you literally wrote the book on Asset Allocation, is there anything you can think of that you would change in terms of your advice in the book now that it's been 12 years since the last revision?
NOTE: u/Important-Builder370 If you have a preferred link to this book, please shoot me a PM and I will gladly update my link or just reply with a better link below. I very much enjoyed the read, and if there's a better way to support you for your work / contribution than Amazon, I'd rather use that.
I've read just about all the books listed below. I would add "All About Asset Allocation"
www.amazon.com/All-About-Asset-Allocation-Second/dp/0071700781
This one goes far beyond what Dave Recommends and shows you how to develop an investment plan.
Read a bunch about asset allocation. Read some more. Make a decision. Research it. Read some more. Make a decision. And then read some more
Personal finance is intensely personal. This isn't the kind of thing you farm out to internet strangers
My only recommendation is https://www.amazon.com/All-About-Asset-Allocation-Second/dp/0071700781
In my opinion, you should be invested into a few different uncorrelated asset classes (and sub-classes) to take advantage of portfolio rebalancing.
https://www.amazon.com/All-About-Asset-Allocation-Second/dp/0071700781