The usual areas the tories like to steer the public conversation towards are not looking good for them:
Law and Order - crime, violent crime, shoplifting, sex crime all increasing significantly since 2015
the economy - has stagnated under the tories, we are dropping further behind similar countries in Europe and many people are struggling.
immigration - has been rising steadily under the tories, and increasing quickly in the last year or so - especially immigration from non eu sources. The number of asylum seekers waiting for their claims to be processed has increased ten fold in a decade.
It's hard to see where they have a leg to stand on on any of those topics, let alone other areas they aren't traditionally strong on- so they will probably try to raise the "culture war" style issues - trans rights etc and i expect them to strt pushing that strongly - either that or declare war on someone.