First comes the list of things I wouldn’t do.
I wouldn’t-
Quit my job,
Fly any class besides coach,
Add on to my house,
Own a luxury vehicle,
Make a donation anywhere in my own name,
Donate buildings to Yeshivas (I think the campaigns are beautiful and give thousands of people the zechus to be part of it),
Let my kids know.
As far as what I would do- mainly look around to see what kind of voids I can fill in the kehila.
Create a Gemach that helps people help themselves (e.g. provide assistance in finishing their education…),
Get Shadchanim under control (e.g. create a training course and certification so that people don’t wake up one morning and say “I’m a Shadchan”… Have some sort of discipline process for Shadchanim who don’t follow the rules- up to losing their certification and being banned from suggesting shidduchim.)
Have a fund of say $5,000,000 to co-sign a mortgage application for families struggling to pay tuition and can’t come up with money for a down payment.
Some other projects but I assume you get the idea.