how do i make new friends

i know this is kind of a stupid question, but im going back to school tomorrow, and something happened today that has solidified my conclusion that my current friends arent really that good of friends. i already go to a different school than them so im planning on just trying to make new friends altogether, especially because ive realised its probably not great to be apart of one group with a few people and pretty much not even talk to anyone else. im already a really shy and quiet person so its always been hard to make friends, or to even talk to people to be honest. i only had actual conversations with maybe four of the people out of all of my classes last year, and i almost always sat alone at lunch. i just want to see if anyone has any tips for talking to people, or seeming more approachable or anything like that