This is a bit of anomaly as last year's elections have been rolled over into this year's.
So we have a bunch of council elections, regional mayors, police and crime commissioners and the by election.
There is a big impact in terms of political momentum and creating a narrative. Generally speaking a governing party does badly in the elections in between General Elections, so in a "usual" year (if they exist anymore) Labour should hold Hartlepool, win the West Midlands mayoralty and win several hundred council seats off the Tories nationwide.
(I may have missed some other expected gains but it is late)
However it looks like the Tories will win Hartlepool for the first time in 60+ years, win mayoral races they should be losing and make gains in councils, possibly contributing to Labour losing Sunderlabd and Durham.
Circumstances are unique with the vaccine but the next GE is two years away and voters seem to remain enamoured with Boris, and Labour falling flat points to a very bad result in 2023 (not that I thought they could win then anyhow under any leader, but that's a separate argument)