I would like to also recommend the Raynox clip-on close-up lens. It’s easy to use. It clips on quickly. I use it with my Panasonic Lumix FZ-80. I can now move closer to things like moths and dragonfly larva in tubs. I get significantly more detail.
I would say that, if you are going to stick with a phone, you can get good photos. A buddy of mine just had the knack of moving very, very slowly to get shots of dragonflies and other skittish critters. But, it takes a lot more patience and a lot more luck than using a camera because you must be very close to the subject.