can't print using wifi with ax1800 router brother HL-L5200dw wifi printer and HL-L2370 brother

The usual practice when replacing a WiFi router is to set up the new router with exactly the same WiFi credentials as the old one.  That way, every device will connect automatically.  There is a good chance that devices will be assigned different network addresses by the new router (unless you go into the management software and specifically assign IP addresses to each device.  Thus, the printers may no longer be "at the same place" and the Windows computers will have to find them again.