Which was one of the big drivers for leaving the EU.What influence?
The UK traded sovereignty for influence.
However, as Brussels gained more power, Qualified Majority Voting became more widespread, an an increasingly assertive German / France axis driving the EU, the UK was also losing influence (and would continue to do so).
That meant the trade off (giving up sovereignty to gain influence) was an increasingly poor deal for the UK.
People like @Brotherton Lad highlight that we have lost influence as a result of Brexit, but it was going to happen anyway.