What both JCope and Cat suggest are both good suggestions.
Some basic ideas of my own when I have issues-
Counting from 60 or 100 backwards.
Yoga or Tai chi.
Consistency helps us maintain and easy way to meditate in my opinion.
Different meditation posture.
Crystals such as-aquamarine,turquoise, and clear quartz.
Other crystals can help for other reasons and purposes.