Should I add ADX?

I'm 41, I already invest in my job's pretax retirement plan, although I would like to retire before 60 IF possible. My question above is in reference to my own personal taxable account. I'm trying to do a growth/dividend mix (with DRIP): VOO VYMI GPIX GPIQ BTCI UTG I've been looking at ADX and I'm wondering whether or not it's worth adding to my current mix. According to testfolio, it beats the SP500 over a 10 year period. But then again I feel like i'm already kinda overexposed to the SP500 with VOO and GPIX. Any thoughts?