Strengthening a friendship is a valuable and rewarding endeavor. It includes building and strengthening the existing bond between two persons. Open and honest communication is one way to strengthen this friendship. Taking the time to have meaningful conversations with friends, and sharing thoughts, feelings, and experiences, can lead to a better understanding. 

Another important part of strengthening a friendship is expressing gratitude and support. Recognizing and celebrating each other's accomplishments, offering support through difficult times, and being available to provide a helping hand can all assist to deepen a friendship. Kindness, simple gestures, and recalling vital aspects of their lives can also show that you value and care about their well-being. Finally, devoting time, effort, and real concern to a friendship can contribute to a deep and lasting bond.