Index Funds in Fidelity Brokerage Account

Hello, I’m 27 and have already invested $6k every year in my Roth IRA. I have additional money that I’d like to invest in the Fidelity brokerage account. I’ve already been investing in FXAIX - Should I continue putting money into that fund or should I choose something else that is more tax efficient/ will it make that big of a difference? I’ve heard that etfs are more tax efficient for brokerage accounts.

I guess TAX efficiency depends on each persons situation, what income and tax bracket you are last taxed on, do you have a substantial amount that you can invest? if you don’t want to pay taxes are you going to buy bonds under your brokerage?