It can be quite difficult to get uptake on these kinds of programs. People tend to be pretty specific about the kinds of activities they like, exercises they want to do, etc. I would consider three different things:
1-- Expand your definition of wellness (and maybe tie that into your mission or one of your values). I think of wellbeing pretty broadly. It could be social, emotional, physical, or mental. It could also be financial. You could vary the programs you do based on an expanded view of what wellbeing is. You could include nutrition, cooking, physical activity, financial wellbeing, etc. And you can tie it into what your company does. For example, if your company is a financial company, maybe your programs should include consultations with financial advisors or student loan debt helpers.
2-- Chat to your people about what is of interest to them and try to get them involved. I often find that programs take off more if it comes from native interests that people have and I respond to the groundswell or feedback I get, as opposed to if I launch it alone based on what I think people will find useful.
3-- Develop a quarterly focus. Create a focus for each quarter and then tie what you offer to that. In this way you can provide bit of variety in what you offer and get people excited about each quarter’s focus. You might decide that one quarter is focused on physical health and then you could bring someone in to talk about nutrition, have an exercise class, or bring in a chair massage. It gives people something fresh to participate in and provides more options overall. Some people just won’t be interested in certain focuses, so if you change them up, you can likely get more people involved over time.