Bored with life

Hey 👋🏻 New here. I’m 33f, UK, partner since I was 18, 2 kids, a good job which I love. I have a small circle of friends and one bestie who I see weekly. Walking is my hobby which I do daily. I should be happy that I have a comfortable life. I am not stuck at home, I have a life, I go out for date nights etc. But I feel like I am missing something and I think it’s the social aspect. My job is lone working (district nurse) and I do feel lonely at times. I thought about doing a course to meet new people but I don’t really know what. Also considered the gym but I guess it’s not really the place to meet people. Any ideas?