how do i make money fast? 

more photos and more work

Buy the angel mini and work with just angels alone. I think 5 angels should be enough for medium level at work you can buy more angels and do the hard work eventually everyday  

the beginning is a bit slow, but luckily it's not as slow as it used to be. 
Go to work, save up money to buy angel figurines at the figure shop
Go work with Mario, if you've accepted that
Fuq his wife to get extra money
Buy small upgrades like better cameras and take lots of photos of Anna
Slowly over time you can start buying services from Star Maker, then ads. 
Yes you will lose a lot of subscribers from Celeste but think of her as the final boss. It won't go away for a while until you reach certain love and subscribers.