I do not have a life and want only the best for my children. What is the most effective way of writing my children a birthday card for their 18th birthday?

I have two children, and both are turning 18. I am sad to see them leave my arms but I am also happy that they will be making the next steps in their lives. I am very proud of the people they have become and I want them to have the best life possible. I know that my kids will be doing big things and I am very excited for them. They both have big dreams and aspirations and I am excited to see them come true. I have been a great parent to them and I know they will become great people. They will do amazing things with their lives! I just want to help them have the best possible life so I want to start by writing them the most sincere and heartfelt birthday card ever. I want to make sure I give them the best advice to make their life the best it can be. I want them to have the best possible life!