The network is able to ping from pc 192.168.1.2 to router interface 192.168.3.1.
1 - Both of your routers have the same IP address (192.168.3.1) on the interface connected to Switch 0.
You must have two different addresses (.1 and .2 for example).
2 - You need a route on each router to tell them where to find the remote network. The most basic way is to add a static route on each
So if the left router has IP 18.104.22.168 and on the right one 192.168.3.2, you need:
on left router
ip route 192.168.2.0 255.255.255.0 192.168.3.2
on right router
ip route 192.168.1.0 255.255.255.0 192.168.3.1