Brexit arguably wasn't even the biggest issue in the general election last year.
Maybe not in the day-to-day media air war, but certainly for voters it was:
https://www.bbc.co.uk/news/uk-politics-40630242 It's a reasonable question, Brexit has dominated the British political media as well as most parliamentary business since 2017: there a lot of things government can't do at the moment because there's no time for other primary legislation.
The key issues other than Brexit are:
a) very low wage growth since the recession despite very good employment figures,
b) quality of public services (e.g. healthcare, local concerns like buses and potholes in roads) given years of cuts (recession created large deficit) and rising demand with an ageing population,
c) concerns about immigration (of course a key driver for Brexit).
Education and crime aren't as big an issue as they once were about 20 years ago due to positive improvements from successive governments, although both are slowly regressing and rising back onto the agenda. But health (and increasingly care of the elderly and vulnerable children) very important.
Key government initiative recently has been a big spending boost for the National Health Service but the demand problems are so severe that eventually we will have to see tax rises on most people for this.
