Some people believe that it is more important to keep the old friends than making new ones since they can make a very strong relationship by focusing on only their few old friends, while other people think differently.
If I were asked to choose, I would say that making new friends is absolutely more important than just keeping a relationship with the old friends for the following two reasons.
To begin with, If we spend a time with only our old friends, we cannot develop anymore.
To be specific, the human being can widely broaden their perspective, when they face new things such as new perspective or new experience.
However, in this situation, If people stop making new friends and keep the relationship only with their previous friends, they would not be able to evolve anymore and would think most of things with their stubborn thinking way.
Since their perspective are never gonna change unless they make some new friends.
Thus, at least to avoid this kind of catastrophe, we have to get a new friend.
For example, when I was 14, I had a bias to people who mostly spend their time in study.
I think that this is because I always spent my time with only popular kids such as active people, so I got a prejudice and bad bias to the person who usually studies rather than enjoying something.
If I built a personal connection with any kind of people, I would not get this bias to different people with me.
On top of that, If we don't try to make a new relationship, our overall ability will be degraded.
When the human being doesn't use their particular ability for a long time, that ability will necessarily be impaired.
Therefore, If we don't try making new friends, we will not be able to treat the people friendly we have never seen before.
Also, losing this ability is so critical in this world because the human being cannot survive by alone and even recent society requires us having a large amount of personal connection to be successful.
Thus, we have to regularly try making new friends.
According to an experiment of Tokyo University, even if people stop using some particular abilities for just a month, the quality of the ability will be quite low.
University assigned basketball players to shoot from half- line for three times and reassigned them to do the same thing after stopping their basketball practice for a month.
As a result, the accuracy of their shooting was less than twice in comparison.
What I mean by this is that the people's ability can be significantly deteriorated, If we stop to use, so we have to regularly make new friends.
To sum up, our perspective will constantly revolve around same level and our ability to fluently make new friends will be impaired.
In this regard, I assert that it is more important to make new relationships more than just keeping.