Hi! Over the weekend I had three LDs. I didn’t use MILD, WILD or any other tecniques. I simply decided to have an LD before I went to sleep. It worked every time. But one problem I have had is that they were all low level. Any tips?
This happens to me too sometimes 
Im usung RC’s IRL and they work (not always).
I would recommend you doing RC’s (check my sig 
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Good luck 
We can work on your particular problem once you tell us in what sense you say the dreams were «low level». 
Other than that, a timeless tip is to read the forum. Just casually, if you will, or for a particular theme using the search function. This forum is 7 years old, and pretty much all basic problems have already been covered in a million different ways. One of them might as well help you. Although as with anything dream-related, the «level» of your lucidity and how to raise it is something somewhat specific to you. So you have to find the technique that best suits you, and for that we can help.
Which gets me back to my first point: how exactly are your lucids «low level»?
When I say,“low level” I hardly remember the dream and go along with the dream instead of doing what I wanted to do.