I would recommend the buddhist mindfulness method, this site has one of the best explanations I have seen (I have shared this multiple times around the web)
The meditation has four progressive stages leading to a highly enjoyable level of concentration. To start with five minutes per stage is a good period of practice.
1. In the first stage you use counting to stay focused on the breath. After the out-breath you count one, then you breathe in and out and count two, and so on up to ten, and then you start again at one.
2. In the second stage you subtly shift where you breathe, counting before the in-breath, anticipating the breath that is coming, but still counting from one to ten, and then starting again at one.
3. In the third stage you drop the counting and just watch the breath as it comes in and goes out.
4. In the final stage the focus of concentration narrows and sharpens, so you pay attention to the subtle sensation on the tip of the nose where the breath first enters and last leaves the body.
https://thebuddhistcentre.com/text/mindfulness-breathing
The meditation has four progressive stages leading to a highly enjoyable level of concentration. To start with five minutes per stage is a good period of practice.
1. In the first stage you use counting to stay focused on the breath. After the out-breath you count one, then you breathe in and out and count two, and so on up to ten, and then you start again at one.
2. In the second stage you subtly shift where you breathe, counting before the in-breath, anticipating the breath that is coming, but still counting from one to ten, and then starting again at one.
3. In the third stage you drop the counting and just watch the breath as it comes in and goes out.
4. In the final stage the focus of concentration narrows and sharpens, so you pay attention to the subtle sensation on the tip of the nose where the breath first enters and last leaves the body.