To make Rahu and Ketu stronger, you can follow these practices:
Observe fasting on Saturdays to appease Rahu.
Chant Rahu and Ketu mantras regularly.
Consider wearing gemstones associated with Rahu and Ketu.
Engage in remedial rituals recommended by a knowledgeable Jyotish.
By incorporating these practices into your life, you can enhance the positive aspects of Rahu and Ketu and mitigate their malefic effects.