Someone specific, or just anybody? There are lots of people out there who have no friends, so making one friend would give you a good shot at being a best friend.
Keep in mind, friendship is not a competition, so if you’re looking to edge someone out of the top spot, you’re probably going about it wrong. But I don’t think that’s what you meant.
The best way to make a friend is to be the friend you wish you had. If you wish someone would call you, call someone. If you wish someone would go somewhere with you, go there and invite people to come along. If nobody wants to join you, maybe you’ll meet someone there who shares your interests.
It’s not necessary that best friends share interests, and it’s perfectly acceptable to tell your best friend you aren’t in the mood for whatever they are doing. But it’s also good to break out of your comfort zone and try new things. Good friends challenge each other, but also support each other.