Add a little item to the AGM agenda along the lines of
“We have to consider a matter so serious I dare not even put the details in print. This could cost each of us thousands of dollars and is guaranteed to seriously diminish the value of our properties. Your urgent attention is required.”
And then when everyone gets there you tell them that the committee is dying because everyone else is too selfish and lazy to contribute.
They let you carry the can and offer zero assistance. So, if you don’t get at least two new members, you are going to walk and the building can fall down around their ears – and that’s where they will lose tens of thousands of dollars.
Has to be worth a try.
Or, if they don’t buy that, when it comes to the election move that there only be one member of the committee (you) and then you can just make the decisions that need to be made.