All exercises that stimulate the brain are suitable. Do them several times a day. This promotes the enjoyment of life and strengthens the focus. Concentrate on essential things. Working more on your plans, visions, and personal strategy is best. A sophisticated concept supports and cultivates active thinking in the long term. As is well known, the most senior people on this earth have the best routines.
The idea of "saying no" has a lot to do with mindfulness and an unwavering determination to, for example, prioritize the recovery process. For many years I smoked, ate sugary foods, watched moderately interesting TV shows etc. Thankfully, alcohol was not an issue.