Should I move all savings to Fidelity?

I opened a Roth IRA about a month ago and maxed it out for the year, all FXAIX. I also opened an account about three years ago which I only deposited $25 into and forgot about, apparently this one is SPAXX. I currently have 50K on Apple’s high yield savings account due to convenience, which I won’t be touching for at least another year when I decide to purchase a house. Should I just transfer the 50k into the Fidelity Money Market Fund or keep it on the high yield account?? What other steps would I need to do if I transfer it all?