The power of observation is a good thing for you to have as a photographer. Hone your skill in this area by people watching, even without your camera. Keep your eye out for things that are out of the ordinary and unusual. Here in Nicaragua, that is easy!!
People photography takes practice. If you do not feel confident photographing people try testing the waters at a parade or festival. At events, people performing are usually used to having their photo taken and there are many photographers. Or join a camera club and get a friend to go with you.
Instagram is full of photos of food but if you're going to do this, do it well. I used to do food photography professionally and let me tell you, food photography is an art unto itself. In these shots taken for Hotel Con Corazon in Granada (our home away from home) I got an action shot of the making of the drink, the creator, and the final product.
Every chance you get to go out to photograph – do it. Take photos as often as you can. I told our group the goal of the tour was to have better photos on day #14 that those from day #1. From what I heard as feedback, that seemed to be the overall consensus.
Look back on your images from a year ago or more and see how far you've come. If you see an improvement then you're going the right direction, keep at it. In the unlikely case that you don't – you just need to do it more often.
Yes, you can learn to take better photos! It's my passion to help you learn photography and take better pictures. It's also the same reason I teach workshops, do photo travel tours, and have online photography courses available.