He has not cancelled any elections, this is a falsehood that was made up by Reform UK and is being parotted by our compliant right wing media. Many local authorities are in the process of being restructured to remove two tiers of government. To avoid holding an election that would be valid for less than a year after which it would have to be held again, the government has recommended that some elections be postponed until the restructuring is complete. Most councils have been happy to comply as running any election is very expensive.
The prison population of the UK is around 92,000. If this is the total sum of everyone who opposes Starmer, he must be pretty popular by modern standards.