Hello,
First off, congratulations of starting university this September ! Very exciting.
Making friends at university can be pretty easy, especially if those people tend to share the same interests you do.
I found that going to icebreaker events at the beginning of your academic year really helps as those events let you speak and connect with multiple different people! Some events are in the day time and aren't around partying (sports fair, food fair)
Usually in freshers, a lot of the events are around the nightlife however I personally don't drink but over my university years I felt that it did not affect my social life and I was able to join. My friends and I were always able to find other activities to do including the cinema, bowling, sports ,and if we were to go outthere are always mocktails and non-alcoholic options.
It also helps to meet with those who live in your flat as these are the people you'll be sharing a living space with and you'll be seeing them often!
Let me know if you have any specific questions!
Best of luck,
Haya