1. Call them. Old school style and ask them how they are connect on a personal level. 
2. Gift them. Send them a token of appreciation.
3. Invite them. To a webinar, an event, or better yet, a 1:1 coffee, lunch, or dinner.
4. Offer them….insights on the legal landscape and how it will affect business and challenges.
5. Give them something free (that they actually want).
6. Thank them.