There are several synonyms for the phrase "wishing you the best" that can be used to express your sincere hopes and well wishes to someone. You can say "good luck" to wish success and prosperity to someone. "All the best" is another phrase that means the same thing. Another synonym is "best wishes," which is commonly used in greeting cards and emails. If you want to express your hope for someone's good health and happiness, you can say "God bless you" or "may you be blessed." "Sending positive vibes your way" is also a modern and casual way to express your positive thoughts and feelings toward someone.