So ge-0/0/1 is part of untrust zone and assigned ip address 193.168.1.2/27. The WAN interface is also in untrust zone. And there is only one untrust to untrust security policy which allows communication to ge-0/0/1 (193.168.1.2) from any source.
Now let me know from where you are trying to which ip? Are you able to reach internet using source as ge-0/0/1 public ip?
eg: ping 8.8.8.8 source 193.168.1.2
traceroute 8.8.8.8 source 193.168.1.2 no-resolve
Since wan and ge-0/0/1 are part of same security zone (intra-zone), you have to allow traffic from 193.168.1.0/27 to internet and vice versa if required
eg:-
set security policies from-zone untrust to-zone untrust policy allow-internet match source-address <193.168.1.0/27>
set security policies from-zone untrust to-zone untrust policy allow-internet match destination-address any
set security policies from-zone untrust to-zone untrust policy allow-internet match application any
set security policies from-zone untrust to-zone untrust policy allow-internet then permit