I found a pack of adhesive grippies with a sand paper like front from Walmart. They’re actually for slip resistant spots like steps
I like using rubber drawer liners from the dollar store to create slip resistant mats for things. You can cut them down to the right size and glue them on.
Hi Fran: One thing you can do is to paint the steps with clear paving paint. Be sure to scrub your steps first and to make sure they are free of debris and grease. You can try using vinegar to get rid of the grease. Sprinkle a goodly amount of fine sand over the wet paint and allow to dry. The results should be reasonably clear steps with some invisible grip! Good luck