How to configure Mikrotik Load balancing
You can also try the script after edit your ISP IP address, DNS and Interface name.............
/ip address
add address=192.186.0.1/24 network=192.168.0.0 broadcast=192.168.0.255 interface=LOCAL
add address=43.231.78.2/29 network=43.231.78.0 broadcast=43.231.78.255 interface=WAN1
add address=172.16.25.45/30 network=172.16.25.44 broadcast=172.16.25.46 interface=WAN2
/ip dns set servers=8.8.8.8
/ip firewall mangle
add chain=input in-interface=WAN1 action=mark-connection new-connection-mark=WAN1_conn
add chain=input in-interface=WAN2 action=mark-connection new-connection-mark=WAN2_conn
add chain=output connection-mark=WAN1_conn action=mark-routing new-routing-mark=to WAN1
add chain=output connection-mark=WAN2_conn action=mark-routing new-routing-mark=to WAN2
add chain=prerouting dst-address=192.168.1.0/24 action=accept in-interface=Local
add chain=prerouting dst-address=192.168.2.0/24 action=accept in-interface=Local
add chain=prerouting dst-address-type=!local in-interface=Local per-connection-classifier=both-addresses-and-ports:2/0 action=mark-connection new-connection-mark=WAN1_conn passthrough=yes
add chain=prerouting dst-address-type=!local in-interface=Local per-connection-classifier=both-addresses-and-ports:2/1 action=mark-connection new-connection-mark=WAN2_conn passthrough=yes
add chain=prerouting connection-mark=WAN1_conn in-interface=Local action=mark-routing new-routing-mark=to_WAN1
add chain=prerouting connection-mark=WAN2_conn in-interface=Local action=mark-routing new-routing-mark=to_WAN2
/ip route
add dst-address=0.0.0.0/0 gateway=43.231.78.1 routing-mark=to_WAN1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=172.16.25.45 routing-mark=to_WAN2 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=43.231.78.1 distance=1 check-gateway=ping
add dst-address=0.0.0.0/0 gateway=172.16.25.45 distance=2 check-gateway=ping
/ip firewall nat
add chain=srcnat out-interface=WAN1 action=masquerade
add chain=srcnat out-interface=WAN2 action=masquerade