I assume you are using default route to your 2 current ISP. If you take a full bgp route table from your new ISP the default route will in effect not be used. More specific prefixes that you learn from your new ISP always are preferred. You should still see the default route in the routing table.
You could have your new ISP only give you default route via bgp and the static default route will override the one learned via bgp.
There longest prefix match is fundimental to how the router works and your only option if you must prefer a more general route over a specific one is to use policy routing.
can you post the config for the static route and also describe what exactly you mean with "the static route went down".
Did the traffic flow go to the new provider only? Well in case you have a static default route and the full internet routing table through BGP in place, this would be what I expect. The underlying reason is, that a router will always pick the longest match from the IP routing table. As your default route is the "shortest match" for all networks learned through BGP, traffic will not follow it as long as there is a more precise network learned through BGP.
To redirect some traffic using static routes you would have to create the same or longer prefix length as a static. Example of show ip route (look similar to):
B 22.214.171.124/8 Serial1
S 0.0.0.0/0 connected to Serial0
traffic to 126.96.36.199/8 goes out through Serial1 because of the BGP route
B 188.8.131.52/8 Serial1
S 184.108.40.206/16 directly connected to Serial0
traffic for 220.127.116.11/16 would go through Serial0, all other traffic to 18.104.22.168/8 would go through Serial1
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