Why did Louis XI, uniting France, not intervene in the war of the Scarlet and White Roses and conquer England?

Despite the failure in the Hundred Years War, the English army was no weaker than the French. All hopes of Louis XI were on the support of one of the English parties in the war of the Scarlet and White Rose and on dragging out the English strife. Therefore, Louis helped with money the Lancaster and Warwick, then the Tudors (against the Yorks), and, finally, his protégé Henry VII defeated Richard III at the Battle of Bosworth.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.