Hey Brian,
If the problem you’re having is running out of things to talk about, then you just need to find new things to talk about. Say when you’re driving and you see that you are running low on fuel, do you sit there/ or keep driving worrying how you are going to solve the issue, no. You automatically know you have to get to a station and refuel your car. The same can be applied to you. Your body/mind is similar to a car and whenever you are running low on things to say/ or do with friends, ou know to go refuel. Refuel by however means you need. Whether it’s learning a new skill/hobby to talk and teach your friends or just go and do a new activity or visit a new place with your friends. With your best friend, there is still time for summer fun and if not autumn is also great with all the fun activities (corn mazes, pumpkins, Halloween). There you go Halloween is a great time. Go to a party with your best friend and show her and others that you have become very interesting. Relate to others and be as diverse as possible and you should be able to maintain friendships.
Thank you and take care.