Enable Ether slot or 3rd isp route when my 1st and 2nd isp is down in netwatch

RouterOS Beginner Basics
1

Good Day..
Hello.. [ Need help ]
i have a failover here

my 1st isp is on Ether 1 - pinged to primary google dns
my 2nd isp is on Ether 2 - pinged to secondary google dns
then my Lan is on Ether 3
my 3rd isp is on Ether 4 ( disabled ) & ( 3rd route disabled ) enables only for backup.

i would like to put a script that if my 1st and 2nd isp is down on netwatch
therefore my Ether 4 and 3rd isp route = enables , then if the two of them (1st & 2nd isp) goes “up” then disables my Ether 4 & 3rd isp route
but then i dont know how what would i code and where should i script.
[need help] tia..

2

Why not just add the third WAN to your failover such that it only is used when WAN1 and WAN are down… seems like a huge over complication??

3

here please check my Config sir.
i have 2 stations
my 1st station has 2isp which i use as wan1 and wan2.
my 2nd station has only 1 my other isp which have big loads of traffic.
but then sometimes my 1st station wan1 and wan2 goes down so i use my 2nd station as for wan3 for emergency backup connection.
i am using pcc load balancing on my 1st station and adjusted for my third wan.
3\0 wan1
3\1 wan2
3\2 wan3
and i placed routing marks for each wan routes.

/ip route
add check-gateway=ping distance=1 gateway=192.168.10.1 routing-mark=wan1-mark
add check-gateway=ping distance=1 gateway=192.168.11.1 routing-mark=wan2-mark
add check-gateway=ping disabled=yes distance=1 gateway=192.168.12.1 routing-mark=wan3-mark

add comment=WAN1 distance=1 gateway=192.168.10.1
add comment=WAN2 distance=2 gateway=192.168.11.1
add comment=WAN3 disabled=yes distance=3 gateway=192.168.12.1

when my wan1 and wan2 is up i disabled my wan3 routing mark to prevents packets.
i am using netwatch for better failover ping:

/ip route
add check-gateway=ping comment="Netwatch WAN3" distance=1 dst-address=\
    8.8.8.8/32 gateway=192.168.12.1
add check-gateway=ping comment="Netwatch WAN2" distance=1 dst-address=\
    8.8.4.4/32 gateway=192.168.11.1
add check-gateway=ping comment="Netwatch WAN3" distance=1 dst-address=\
    1.1.1.1/32 gateway=192.168.10.1



/tool netwatch
add comment=“Failover WAN1” down-script=“:log warning "wan1 timeout";\r
\n/ip route disable [find comment=WAN1]\r
\n/ip route disable [find routing-mark="wan1-mark"]\r
\n/ip route enable [find comment=WAN3]\r
\n/ip route enable [find routing-mark="wan3-mark"]\r
\n” host=8.8.8.8 interval=10s up-script=“:log warning "wan1 is up";\r
\n/ip route enable [find comment=WAN1]\r
\n/ip route enable [find routing-mark=\wan1-mark"]\r
\n/ip route disable [find comment=WAN3]\r
\n/ip route disable [find routing-mark="wan3-mark"]\r
\n”
add comment=“Failover WAN2” down-script=“:log warning "wan2 timeout";\r
\n/ip route disable [find comment=WAN2]\r
\n/ip route disable [find routing-mark="wan2-mark"]\r
\n/ip route enable [find comment=WAN3]\r
\n/ip route enable [find routing-mark="wan3-mark"]\r
\n” host=8.8.4.4 interval=10s up-script=“:log warning "isp2 is up";\r
\n/ip route enable [find comment=WAN2]\r
\n/ip route enable [find routing-mark="wan2-mark"]\r
\n/ip route disable [find comment=WAN3]\r
\n/ip route disable [find routing-mark="wan3-mark"]\r
\n\r
\n\r
\n”
add comment=“Check WAN3” down-script=“:log warning "wan3 timeout";\r
\n/ip route disable [find comment=WAN3]\r
\n/ip route disable [find routing-mark="wan3-mark"]\r
\n” host=8.8.4.4 interval=10s up-script=“:log warning "isp3 is up";\r
\n/ip route enable [find comment=WAN3]\r
\n/ip route enable [find routing-mark="wan3-mark"]\r
\n\r
\n”

i wanted to enable my 3rd wan and its routingmark only whenever my 2 isp goes down. and maybe it only goes for script.