Keep your general relays for now. Add some public and free relays in your public inbox. If you run a local relay like citrine on your phone you can add it to local and private relays. For private inbox, ideally use a auth relay or a private one, but it can be any relay
Discussion
It's important that they are free as other people might use them to send you notes. If they don't pay for a relay you might end up not getting their notes.