it's obvious that the downswing or the varience hasn't hit you. 100$ is not much to move up yet. Stick with the same bankroll management till you hit 150$ then either play 5dolar sngs or you can certainly play .5/.10 ring games, but the transaction might cost you.
a good bankroll management is to have 20 buyins to keep the varience under control. so always keep that in mind.
Ring games are much more complicated even in the smallest stakes. So getting used to it might be expensive, but heck it, you have to learn the game somehow. Don't get money oriented, read forums, watch videos etc.
Varience is better in the cash games and if you are a good player, thats where you'll find a steady income. Usually you can not double up in half an hour like you do in sng's, it takes more time and patience (you have to get to know your opponents then play accordingly), and much more complicated level of thinking on each hand, but the reward is better. And it certainly is a hell lot more fun!
and about multitabling, first do the transaction to cash games, when you feel you've got the hang of it open up a second one