IPv6 ISP connection, and IPv4 static IP just for incoming web requests???

[kevin192291]

Hello, Let me explain my setup
I have an ISP that wants everyone on IPv6, however, for a static IP, they only offer IPv4 :/
I am wondering if I can setup OpnSense to use both at the same time? Is this even possible? (sorry I am not very well versed in this). They do offer something called IPv4 Over IPv6, But, I am not sure if that supports the static IP. The issue is that some of the incomming connections rightnow are lagging a ton as the IPv4 network is overloaded, and down data is running at only around 4mbps, when the connection I am paying for is 1bgps.
This may have been a bit disjointed, and have made little sense, but if anyone could help me, I would be very greatful.

(for more info)
Here is my provider: https://asahi-net.jp/service/option/ipv6/4over6.html
and this explains (sorta...) IPv6 over v4 :/

Thank you so much,
-Kevin