I would consider 3 things, depending on your SO.
1) meet with a professional wealth advisor/ retirement advisor/ Financial planner. Maybe hearing it from an expert might help. Also just talking to the SO about when they think you should retire, how you will finance your life when you retire, and what that money in the investment accounts will be used for might help.
2) Starting today, write down the balance of all accounts. In one year, compare. Show the SO the figures: We made $40,000 this year on investments, + $18,000 on the rental/ alternative income. If we took our needs of the accounts to live on for the upcoming year we would still be SAVING $13,000 a year. (Maybe you have the data to do this comparison from 1 year ago? Maybe this is something you can determine from your taxes?)
3) Start with not retirement: Talk about planning a 3 week vacation this summer. Then another 3 week vacation at Christmas. Talk about going "part time" at work so that you always have 3 day weekends but make less.