Help Nat/Routing

[neo09]

Hi everyone, I'm new to forum and pfsense.
I expose you to my problem with the hope that someone can point me the right way.
As with the image, I have a pfsense behind a Cisco router (ir809) connected in 4G.
With the router, close a vpn (EASYVPN) to a Cisco Ace.
From the net behind the pfsense if I try to ping the net behind the asa, after setting the correct route on the ax I can ping but if I feel the opposite, I arrive to the pfsense WAN interface but I can not reach what it is Behind the pfsense LAN.
Where am I wrong?

Thanks to anyone who will help me