When I first started playing
poker online it wasnt uncommon for me to deposit 50 dollars and grow it to about 600-700 within 4-6 days. In fact it happened pretty much every time I ever deposited. But eventually I would always go bust. I didn't go bust because I wasn't good at playing poker, It was because I wasn't good at managing my Bankroll.
Bankroll management is key if you want to maintain a BR. Sure, you can easily grow your bankroll wildly by buying in to a ring game with 50 or even 100 percent of your BR and doubling up, but when your aces start loosing to j's and your j's start loosing to 56 suited, you'll soon realise that 1 or 2 buyins just doesn't cut it. Realisticly you need at least 10-15 - Personally I prefer 20-25.
I now practise strict br mangment and still enjoy the same wins. The only difference is im also able to cope with whatever variance comes my way because I always have at least 20 buy ins to what ever limits im playing. I recommend you do the same because variance will hit you sooner or later.