Best place to put money for saving for a house?

[Emmy Timberlake]

I am a few years away from buying my first house, and am wondering where to save up for that. Currently, I invest through Betterment with a general investing plan and a Roth IRA, and I also contribute to my employers Roth 401k plan. I also have a HYSA. I want to start a separate bucket for house funds, but am not sure what to do/where to put this where I can get the most out of it in a few years. Thank you!