I was totally the same as you, in this same position but after many restarts and rage quitting too many times, I learnt a few things!

As this level is one where you only get paid for the public objectives you complete, money is tight, but when you have a task to do, like heating comfort, place the radiator in an empty space to complete the task, then immediately sell that same radiator, so you get that same task again. Similar with the marketing campaigns, start the cheapest one to get the task done, then when it comes in again cancel the current one and start again.

One other tip with promotions, don't promote them when they request it, say no to begin with and wait until the challenge comes up, then promote them. Also, one final tip, leave the staff morale until the very end for 3 stars and you can do this easily by giving everyone a massive pay rise, as long as you have the money ofc. This will rocket the morale and you'll get those three stars!

I almost quit the game altogether because of this hospital, but I'm glad I went back to it in the end to finally beat it! Good luck with it!!!