Re: Two ISP - Two WAN ( 1 - Static, 1 - Dynamic) - Link Redundancy
Maybe I'm misunderstanding, but it seems the answer to your question is in the question. If your current policy only allows the wifi interfaces to access wan1 and you have not added any policies for wan2, then when you modify your routing to go out wan2 it would be dropped by firewall policy. It is best to use zones or SD-WAN for this purpose so you don't have to make redundant policies, but if you have a lot of config that can be difficult as you basically have to re-do it all.
If you want some help, I have occasionally offered to help remotely (Zoom or TeamViewer) for a reasonable fee. It would probably have to be outside 8-5 (my normal job), but if I can look "over your shoulder" I can probably help you more quickly. Private message me if you want to do that.
Thanks - Daniel