I would recommend unvarnished Buddhism, not mindfulness in a pill that is being taught by these crazy apps. Buddhism teaches mindfulness in the context of wisdom and morality, not just mindfulness. Moreover the word itself is a horrible translation of the Pali word “Sati” which means “remembering to be aware of the state of your mind”. The key is “remembering to be aware”, not just “awareness”.
You can become aware on your own by accident. In fact a lot of us do that. Remembering to be aware means there is a muscle memory that does automatic mental state check, there is an intention behind this state check.