My entire Roth is in large cap. Can someone please suggest some mid and small cap etf?

Hey folks! My Roth IRA compromises of 55% VOO and 45% QQQ. I am thinking of reducing QQQ to 30 and introducing mid and small cap etf to my account. Maybe 10% mid cap and 5% small cap.

Vangaurd’s VO and VB looks like a decent, low cost etf. Are there any other ETFs you guys invest in?

Thank you.