Thinking about strategy more. Best way is for the SNP and Greens to either be extremely hot or cold for the first while. Labour's manifesto is scuppered without them, so either:
A) form a de facto effective coalition where Labour get everything they want for a while, isolating them from the tories and lib dems gradually through some key votes. After which point you can influence them knowing they can't turn to the other, now effective opposition, parties easily.
Or
B) let them have their lib lab tory coalition, opposing everything you remotely dislike, assuming there will be huge disagreements between those three and labour will hate it so much they come running back.
Everything in the middle of those two strategies allows Labour to take the median stance in all debates and just threaten both sides they'll bend the other way until one side or another bends Labour's way.
Option A) has less upside but, perhaps more importantly, less downside for the city.
I suppose you could also lay out full throated opposition or a coalition agreement too. Some hints from Scott Arthur of willingness to bend. (realism that 20% of seats can't be 100% of power)
https://twitter.com/CllrScottArthur/status/1529901775800647681