Hi @mohammedalrawiib suggests see this post
https://community.cisco.com/t5/routing/load-balancing-and-failover-for-isp-links/td-p/4037409
Let´s me know if this work for you lab.
Kind regards
I believe that you don´t need to configure static routes, due both network is directly connected to the ASA.But is needed traffic permits between both security zones.Kind regards