biggest hurdle in my goal achievement. 25 level

3 day ago I challenged myself to reach at 25 level in 1 week, but now I have huge hurdle in my way to achieve 25 level. I as new player I was unaware about energy. at the start I was getting enough energy to complete daily missions and it was seems too easy to reach level 25 but now it looks very difficult to achieve.

I can't get enough pizza to get energy refill. refill energy works too slow it's take more than an hour to fill 15%.

this part of the game is quite boring.

I don't think now I could reach at level 25 in 1 week.

I'm getting bored please suggest something else to get rid of this.

thank you