Look at how important this friend is to you. If it is very important, give him something commemorative or practical. You can give him something commemorative so that he can always think of you. You can also give him clothes so that he can think of the gift when he wears it, or photos of you two together so that he can keep them forever.
In short, you will know your friend better and you know her preferences. When she sees the gift you give, she will think of you as a friend, and think of the time when you worked together or went out to play.
For men, you can give him a watch, because men are sometimes very careless about time. Giving him a watch can remind him to seize the time no matter what he does and not waste his time. Time really passes quickly. If you are not careful, time will sneak away from you. The storage time of a watch is also relatively long. In this way, when the other person looks at the watch, he will think of you, and remember that the watch was given by you, his good friend. The gift given to him is also a blessing to him. Friends should be like this. No matter where they are, they will think of each other and know that they are still blessing and caring for themselves in other places.