I use Azire, maybe see if they would work for you? They have port forwarding and don’t rotate their IPs that often.

It doesn’t cost extra, though the IP changes often. You could however buy a dedicated IP, which supports PF and costs extra. I tried PIA in July and it worked well, but the IP changes were annoying when hosting my Minecraft server.

Fellow Swede here; may I please ask what mobile operator you use? I pay around $25 for 16 gigabytes from Vimla