Do you know what build you're aiming for exactly? A good way of getting your charm to 3 is:
Spam profiles, preferably private ones and spam click as fast as possible until it reaches 2.
Buy the same item from a store 1 by 1. About 500 should do it. Sounds long and boring but it's not actually that bad.
That will get you a 3 in charm straight away, but what you need to remember is that if you're spamming HP pots for power, you charm will go up to 4 when your power reaches 2 and 5 when your power reaches 4. If a charm Spinel is what you're after then you'll be fine.
Mazuiko & Synkronized (ɔˆ ³(ˆ⌣ˆc)
Te amo! ♥