I am also a solo female hiker living in the West Yorkshire area, can’t recommend the app All Trails enough - it’s £30 a year subscription and worth every penny. Shows you loads of amazing hikes as well as pictures and reviews. I have never felt unsafe hiking by myself but I do always have my dog with me, I always tell someone where I’m going too. Also don’t worry about being on your own, literally nobody cares, and so many other people are on their own too!