There are lots of benefits to Brexit.
The main one is that it shows the political system actually works for the people, it carries out their will rather than just tell them what they should think. The people of the UK voted in favour of it, and it is being carried out. That's what democracy is, the will of the majority. The losers can be pissed off and vote to change things when they next get the chance, but that's democracy - you don't always get the outcome you want, but next time you might. Democracy isn't perfect, but it's better than the other systems of government that have been tried from time to time (think that was Churchill rather than me).
Britain has had two opportunities to "correct" the Leave vote, but the people chose not to do so. At either general election Remainers could have got behind a pro-Remain party, got into power, and cancelled Brexit altogether. Ironically they could have done this with a much smaller share of the vote than in the referendum, certainly a majority wasn't needed. But, they were too disorganised - or not interested enough - to do this.
Other obvious benefits are the end to free movement and the return of duty free shopping. Free movement is great in theory, but in practice only works if roughly similar numbers of people enter a country as leave it. The return of duty free means people can buy a reasonable quantity of cheap booze, like a bottle of spirits, rather than the idiotic "booze cruise" to Calais to stock up on supermarket plonk for your mates.
Sure, prices are likely to rise in the short term. But that's only because the EU is insisting on it. The UK would do a free trade deal, no problem, but the EU wants to tack on other things, to bully the UK into submission.
And that is the best thing about leaving the EU - why remain in a club whose members treat us like that?