Can You Win Consistently at Luck online casino Online?

Has anyone here managed to actually turn a steady profit playing slots or table games over a few months? I started spinning on weekends back in May, mostly sticking to blackjack and low-volatility slots. I had a decent run at first and hit a nice $400 payout, but the past few weeks wiped all those gains right back out. Is long-term winning just a total myth, or am I missing something basic about bankroll management?