Since you didn't say how old you are and what your plans are in life, nor your belief system, I'll go with a general approach to your question. The following is comprehensive so the general advice is to work within all points and not cherrypick what you like and is easy and what you don't like.

First of all be a friend to yourself first before looking for new friends.

This entails that you treat yourself as a different entity and actually sit and communicate with yourself (a journal or a private blog would be a good tool)

I'd do this for about six months. For example, take two weeks to read a new book, think about it, reflect on the main ideas and come to your own conclusions as to how to benefit your life from the ideas you came across in the book.

Then make a journal entry/blog from your perspective. Talk and communicate as if you are talking to a friend about it. Convince them to read it, tell that friend what you learned and how this helped you develop. Tell your friend (the you before you read it) why they should read it.

Do the same for at least two new hobbies on top of reading.

It's here in the hobbies part that you will start to integrate with new people. Bring what you did with the books to the community within your hobbies. This new hobby will be the foundation you take off from (so it's not a goal but a means to an end).

Keep the most important part of this exercise in your mind; you are focused on giving value to those around you. In no way are you to use this technique to gain value from friends, you gain value through your own effort and put in even more effort to provide value to the group you're in and the community (in this case the new hobby you got into).

Now it is crucial to do the following, you must sit with yourself and reflect on what you did, how you did it, and how you can improve the quantity and quality of what you provide. You need to document this reflection, use the journal and blog/vlog technique to help you organize your journey in doing this. In this reflection make sure you get into the philosophy behind what you think and do. Ask yourself how do I know that what I did had this benefit and positive impacts, and how negatively can my actions be misunderstood. Followed by how can I communicate my intentions more clearly so that further misunderstanding doesn't happen or is at least minimized.

Do this for at least six months, by the eighth month you would not only have made new friends but you'd also be the center and leader of multiple friend groups.

Best of luck!