You can chant this mantra for Krishna Puja during Janmashtami. It is a simple yet powerful mantra. You should use it for peace and success in love. Again, it overcomes adverse situations effectively. When you do it faithfully, it results in positive outcomes.
Again, you can use this mantra to reclaim lost love. Start it on a Friday or a Saturday. Now, chant it for 45 days to attain siddhi. Later, you can do it every day for 108 times. Do it early in the morning or at dusk. First, take a bath and wear washed clothes. However, chant Ganesha mantra for 108 times thrice before beginning Krishna mantra. A strong desire will witness miracles fast.

https://www.astroguruhelpline.com/radha-krishna-mantra-for-love-success/