What single thing do you think women should do?

Care, love and gentleness.

To recognize that, together with the scope of emotions we all humans have in common (most of them), there are some that have a special wheight / importance / specific meaning for men (as symmetrically happens for women).
But seems to me that said emotions (or the meaning / importance of them) are not frequently accepted as such or as valid ones.

IMO this would improve the quality of the interactions and relationships between genders.

Respect them and treat them just like you need to be treatef

Love the person they are with

Be honest if they like a guy

Whatever tf they want.