Maxed out Roth, what to invest into taxable along with VT, or just VT alone

Maxed out Roth, what to invest into taxable along with VT, or just VT alone In my mid-30’s, I have my Roth maxed out invested in VOO and VXUS, 20% of my pay going into my work Simple-IRA, about 5 years of expenses in a HYSA, I want to retire in the 50-55 year age range. I started a taxable brokerage for money for between retirement and 59.5 years old. I started buying VT. What should I pair with it for my taxable brokerage or just VT?