Sen, your basic technique is right.
To change the quality of your foam into microfoam requires a bit of playing around with your size jug (smaller is easier with less powerful machines), wand positions (the oclock positions), refining the wand depths (as youve already discovered) and whether you can get a whirlpool or tumble happening in your size jug.
I suggest starting with a 300ml jug, and fill it half-way with water. Start steaming as usual and watch the water swirl. Try to get a tumble or whirlpool happening.
Then drop into your local supermarket and buy 3-6 litres of milk just for practise.
Have fun!

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