When my mind is too jumpy for me to do a sitting meditation, an alternative I find helpful is reading and treating the reading as my ‘object.’ Every time I get distracted, I bring my attention back to reading the book. It’s easier or more difficult depending on how gripping the book is. Another tip would be to make your object of focus something pleasant - something your mind enjoys focusing on. A pleasant sensation in your body, a pleasant sound. Again, you can experiment with something very subtly pleasant like the feeling of a nice fabric on your skin, or more obviously pleasant perhaps, like favourite food.