Well, it'd be helpful to know what your allocation is in the retirement accounts. Re: the Robinhood, do you have any particular reason for focusing on U.S. large cap? Switching out for a total U.S. market ETF and adding international shares would diversify your portfolio, in theory giving you same or better returns with less volatility.
Also, the 0.09% on the SPY is better than vanguard's investor-level S&P 500 mutual fund at 0.14%, but the admiral shares or the comparable ETF are both 0.04%. Which is not a massive difference, but it is lower than 0.09.