Who were you with previously, was it any better and can you go back? Non-BT backed lines as Blaineoliver mentioned would bypass the bottleneck if they are available.
Check to see who has equipment at the exchange
https://availability.samknows.com/broadband/ and see who the other options are. One of the issues with Openreach is that you cannot really talk to them, they are a B2B supplier, when I had half a dozen engineers out to 'fix' my line I always had to go through EE (still waiting for a call back from them to check everything is OK, been 3 months...) so you can't go to them for technical information which would be useful. So you may just have to phone each supplier, try and talk to someone technically competent and try and get an honest response about capacity on the exchange.
How's your 4G signal in the house? If it's good then you could get a dongle for streaming and a less good but potentially more reliable landline connection for gaming?
Curve ball, but if there's a supplier in your area there is money available for someone to dig up your road and fit non-BT FTP:
https://gigabitvoucher.culture.gov.uk/ and
https://gigabitvoucher.culture.gov.u...nts/suppliers/. If you're neighbours are equally unhappy and you can put in some legwork to get people on board then the result could be actually superfast broadband.