Lots of people seem to be misunderstanding where OP is at.
Training and NW go hand in hand.
OP has very low NW, but battlestats are unknown.
Battlestats also aren't as important as they once were... And battlestats aren't as important as activity.
The suggestion to wait until Halloweek isn't terrible; if you've not enough networth today to be slamming a Points Energy Refill every day, Halloweek is an exceptionally good use of those refills. 100 special refills represent a 3x multiple of the natural E you can otherwise gain during the Halloweek event(5k vs 15k E).
OP would be better off slamming a Xanax or two a day instead of a Points Refill per day, economically speaking. Daily Energy refills aren't generally recommended until you're reliably slamming back at least 2, and usually 3 Xanax a day.
Also, OP's overall activity and account age indicates it is distinctly possible they have long passed the HJ range of battlestats, making the HJ idea even less valuable.
Better yet, subscribe to the game and start doing the daily missions, and hope you can get Book: Ugly Energy before Halloweek. This increases your max E to 250 for 31 days. This makes your total 100 refills worth 25k Energy during Halloweek, a five fold increase over just using natural E.