https://www.gsmarena.com/honor_6x-8388.php
Is there a particular reason as to why you need to stay with Cricket? Other carriers will apparently still support your Honor 6x. A popular service with economical pricing is Mint Mobile:
https://www.mintmobile.com/
Check availability and coverage in your specific location though (Cricket being a MVNO tied to AT&T's cellular network while Mint is contracted to T-Mobile.)
On the other hand, your current phone is five years old. It's still quite usable as is for a lot of things of course, but don't ignore the fact that it's also running a dated, no longer supported version of Android so there are security and/or privacy concerns that we all need to pay more attention to.
If you do opt to keep using your Honor 6x, but with a different carrier that isn't writing that model off so abruptly, just be very attentive to what apps you might install and to whatever online services you interact with.