you don't seem to have realistic expectations. Europe heavily relied on Russian gas and it is not reasonable to expect that to magically instantaneously be replaced. The price of gas increased due to market conditions, not due to the EU. In the short term there was simply zero choice but to continue the import, while alternative sources were negotiated. The EU did this in record time, and archived their import goals ahead of schedule. The profits from gas purchases were covered by an extensive set of sanctions brought in very rapidly that havea much larger impact than the UK's, even normalising by population
Longer term the EU have brought forward 100% renewable energy plans. Many EU countries will be close to 100% renewable (or nuclear) by 2030-35 such as Portugal,Austria, Germany, Netherlands, Denmark, with many others at 75-95% renewable by then. The UK is not commiting to any such aggressive timeline, despite being in a prime location like the other nordic countries . The UK could be a leader in renewable energy exporter, but instead is fighting over fracking rights.
In all of this there are a lot of variables. If the whole EU immediately shut down all gas imports then there would have been the most severe global recession ever seen, and hundreds of millions of people would be in winter without sufficient power, left in the dark and cold. Europe would have been weakened massively with minimal impact on Russia. Paying for Russian gas short term had long term benefits for Europe to stay strong and impact Russia much more severely in the years to come.
The problem we all face now is the west is too scared of nuclear weapons to properly end the war, and Russia still has massive military operational capability and a disregard for Russian lives. Since the west wont end the war, it is entirely up to Russia. They either put their tail between their legs and pull out (but only if their is some gesture from Ukraine to provide Putin with a plausible win), or Russia goes on a war footing and through sheer capacity will eventually win, or Putin is taken out and some other oligarch takes over who doesn't care about Ukraine and pulls out with some pretense of democracy and good will to the west in attempt to reduce sanctions .As it stands, sending arms to Ukraine won't actually make them win outright, it just allows them to survive longer. That is still important, but it is Russia that still has control. Outside the happy headlines, experts are still pessimistic of short term Ukrainian success. The west supplying short range weapons doesn't lead to Ukraine expelling Russia entirely, but does cost Russian lives and resources. Tje end of the war is entirely within Putin's hands, either a conscious decision to cut losses or someone inside taking him out.