I quit dairy years ago because it just didn't agree with me, and I quit meat cold turkey a good while back now.
I eat 85% plant based or whole food and occasionally (once a week or so), eat vegan processed food like beyond burger or vegan magnums.
I quit meat for my health, my family have a long history of colorectal/stomach cancers so I wanted to reduce the risk.
I'll eat goat cheese on occasion, and if I'm in a group setting I'll just go with the vegetarian option but I'm not bothered if I'm eating a meal full of cheese, white pasta and cream. Life is too short to worry when amongst friends.
I have found since quitting meat though, that my asthma is almost non-existent and disappeared practically overnight.
I love eating this way, I enjoy making new recipes, I'm far more adventurous at cooking now that's when I was in paleo/keto. I feel lighter in myself and my running speed increased by a minute mile quicker within a week.
I supplement with B12 but nothing else, and I don't worry about protein. The only thing I have to ensure is that I eat enough calories if I'm working out as often can eat 3 meals a day and still fail to hit 1000 cals which isn't great when working out a lot.
PS. I was a massive meat eater, ate steak at least twice a week. I was adamant that I could never give up meat because I loved it too much. Here I am and I don't miss it at all which is what I found so strange!