First, any win rate that's positive is great because you're at least beating the other players + Rake, which is not insignificant. It buys you unlimited time to improve. So nice job.

Second, win rates of 5 ptBB/100 (or 10 BB/100) are very possible at 10nl and below, and many players have seen 25k stretches north of 10 ptBB/100 (or 20 BB/100) winrates at 5nl and 10nl. If you're currently making money, but barely, at micro stakes, you probably have big leaks in game.

Third, think of it this way. If you are capable of winning at 5 ptBB/100, then you could drop back from 15 tables to FIVE and make MORE money per hour than you're 1.5 ptBB/100 rate is winning for you. Also, from personal experience, I will tell you that massive multitabling is NOT going to help you work on your game. You need to focus more attention on each hand you play. When multitabling more than 7 or 8 FR tables and more than 4 or 5 6m tables, you're missing a ton of value. I learn most when I play on 3 or 4 6max tables and 5 or 6 FR tables.

Fourth, moving up from the micros to small stakes is MUCH more valuable to your long term win rate (calculate 2 ptBB/100 at 100nl over half a dozen tables - THAT'S where you're aiming). So cut back on the tables, work on your game, and you'll move up more quickly, imo. Again, I made the mistake for months of trying to multitable too massively too soon. I cut way back on tables, learned the game. When I finally plugged my biggest leaks, I moved up to 25nl and 50nl in about 6 weeks each. Never playing a huge number of tables, but winning solidly on each one.