It seems like a relatively easy problem to solve because the media coverage has not exactly been honest about.... well, anything really. The big problem the UK and EU face is that energy prices are through the roof because there's not enough energy available - we're talking natural gas prices something ludicrous like ten times those in the USA, with electricity prices similarly high since they're effectively set by the price of natural gas - and this is utterly wrecking the economy. The EU does not have any solution to this. Another big problem is that the Fed in the US has increased interest rates rapidly to try and fight inflation, dropping the value of the Euro and pound and making energy imports even more unaffordable. The Eurozone is actually in an even worse position to fight this than the UK because that requires raising interest rates, which they can't do without vulnerable member states having their government bonds implode and take the economy with them.
You're also ignoring the reason the UK never joined the Euro in the first place: our economy was just too badly aligned with Germany's, and sharing a currency under that scenario leads to the kind of problems that Italy and Greece have experienced. The level of austerity forced on Greece in particular by the EU as a result of this and the damage it did makes the Tory "austerity" people complain about elsewhere in the comments look like a generous left-wing paradise by comparison.