When we meditate, do not do it with much effort. Just sit comfortably and be happy first. When the body and mind are comfortable, we will soon see the Dhamma within naturally.
We can only be happy when we do not think about anything. If you want to think, you must only think about the crystal sphere, the Buddha image, or the Great Master with a happy and comfortable feeling to prevent your mind from thinking about other things.
Think of the images relaxingly in order to make your body feel comfortable and your mind feel relaxed as this is the happiness path.