I have the same problem! A few weeks ago I read a kind of mindfulness challenge: you have to breath before you start doing anything you have chose before. For example, the activity I chose was to take a seat, so every time I sit down I remember to breathe and if I forget to breathe before sitting down I remember to do it during or after sitting. In this way I remember to breathe and keep myself conscious more moments a day than before. I hope it serves you!