Also, don’t want prioritisation, want all if possible.
You can’t fit a pint into a half-pint mug. Though that said, a 32Mbps connection should be up to doing both. Arguably, your gaming issue may have nothing to do with raw bandwidth but rather latency.
Prioritising isn’t about raw throughput per se, it’s about treating traffic differently. If you have a one second delay on a video it would be unwatchable; if you have a one second delay on a website you probably wouldn’t even notice.
Are you streaming 4K video? Off the top of my head, Netflix recommends a 25Mbps connection minimum for that. Try knocking the quality down to 1080 maybe, see if that fixes it?