I think one idea is to give specific complements like "your eyes are beautiful" or "i like how your earrings match your top"

I think another idea might be to try to increase safe respectful touching (touch her hand to see her ring for example).

What else? What are other good ways to tease or flirt or increase sexual tension?

I've been out of dating for a long time because I was married and divorced. Now I am just starting to get back into dating but finding that I am struggling in most of my first dates because it has been so long. There have now been at least three dates where the girl has told me she does not see a romantic connection but more of a platonic vibe or platonic interactions so I believe I need to change my approach asap. Additionally, if there are any good books on this topics that anyone has read, can you give me the recommendation?