Vanguard has a wonderful chart you should use when planning your own investments.
You can slice and dice your portfolio anyway you want put remember fees and taxes are the biggest headwind you face.
Keep your fees and taxes low and you will most likely outperform the vast majority of your peers. Not all the time, of course, but more often than not.
So always remember, complexity does not equal investment success. Keep it Simple, Stupid is the #1 investing rule to follow.
And that is what makes Vanguard so great. You can get a wonderful, low cost, low turnover (tax) portfolio with just 4 of their ETFs. And then you’re done.
No fuss, no mess.