Best option right now is an election, its really our only path to stability. But the Tories will hang on for as long as they can as they are expecting to be wiped out if they held an election right now.
For example... Anyone can gather 100 signatures asking for an election. Then the electoral commission will select 1000 people at random from the electoral register and ask them "Should the UK hold an immediate election?". And then if the majority of those responding say yes, then an election happens.
To your point, though, there is "a way for the people to request an election anytime", and it has been used already, to little effect:
https://www.standard.co.uk/news/politics/when-next-general-e...
Queue in gerrymandering.
The worst that can happen is nuisance elections.