Do i understand your network Topology correctly ?
You have a Mikrotik-Device with following Networks,
WAN1
WAN2
LAN1 (192.168.10.0/24)
LAN2 (192.168.11.0/24)
Routing:
LAN1 -> WAN1 as a Gateway
LAN2 -> WAN2 as a Gateway
Firewall:
LAN1 isn't allowed to communicate with LAN2