Board of Directors Election Votes

Are there any methods your credit unions have used to increase the number of votes for the board of directors election?  My credit union has ads on the website, in online banking, and on social media; tellers put sticky notes with a printed reminder to vote on member receipts; emails specifically for voting are sent; and reminders are included in member newsletters.   I know votes are typically low compared to the total membership, but my Supervisory Committee has been asking about ways to increase voting.  Thanks.