After the new update the subscriber is so hard to increase,and the subscriber deduction is so high cant even go to 3 hearts
It's rough at first, but you just need to invest in skills that gives you followers/subs/fans per photo. Also, invest in passive money income as well as go to Work so you can get some money to buy the better cameras from the tech guy at the Mall. If you want an easier time with the minigame at Work, get enough money to buy an Angel figurine at the Comic Shop. She damages all bugs per second!
Doesn't sound like you're getting skills that resolve your issue. Most of them can be gotten under the Stardom tree. Get skills like Loyal Makers, All-Star, Fan Magnet, etc. Even under Creator you can get the Marketing (both levels) and Critical Shots and Perfect Shots. Also go invest in an Active Campaign. Since you're concerned about subscribers then you'll want Trial Campaign in particular. Last but not least (and I haven't confirmed this yet, but it's on the FAQ) you can complete Celeste's questline to stop her from stealing followers.