The verb refocus means to readjust an optical device. If you are looking at the planets with a telescope, you may have to refocus the telescope to make everything come in clearly.
The verb refocus can also mean to change priorities and concentrate on something different from before. When football season finally ends, maybe you will have the opportunity to refocus and concentrate on your studies. Refocus also means to focus anew. If your book club book is boring, you might have to refocus and give it another chance.