There is no one-size-fits-all solution to changing behaviors, the best solution depends on the particulars of the situation.
Chess Quote
To a chess master: “What’s the best move in chess?” Chess master: …“there is no ‘best move’”
There is no panacea for behavior change. You have to look uniquely at your circumstances. What’s standing in your way? What’s stopping you? What might be an effective mitigation given the particulars of the situation? An example was used involving tennis legend who only truly got good once he started tailoring his game to his particular opponent’s weaknesses rather than continuing to focus on his own strengths.
Thankfully, there are some obviously bad things you can just always avoid.