Multi-tabling is fine if you are serious about making money, and are a good enough player, but when I tried it years ago I found it to be hard work, juggling between tables and getting buzzed from other tables when it was your turn to act, Poker became less fun to play and more like a job of work.
So I quit trying to make money and concentrated on one table at a time, I found it a lot less stressful and started to have fun again, Poker is a game I enjoy, winning or losing, as you will always have losses along the way, it is just the nature of the game, and if anyone said they win all the time, then I am afraid they are either deluding themselves or a complete liar, No one is that good and even the best have bad days.
When the fun Stops, STOP!