Another year of excellence! Thank your colleague for all the amazing work he has done. Your effort and enthusiasm are much needed, and very much appreciated for him. From the core of your heart wish happy job anniversary!
Dear [Name of your colleague],
Congratulations on your work anniversary!
I couldn’t let your work anniversary pass without sending my best wishes. I am so blessed to have such a smart, thoughtful, and talented person like you. Today marks the  years you’ve been at this job. Hope you stick around for many more because you’re one of the best colleagues, co-worker & employees of the company!
The company has changed a lot in the  years you’ve been here. I’m sure you’ve seen and done it all. And yet you still treat every day at the workplace like it’s your first day on the job. All these years you have been proving your worth quite successfully to us and we couldn’t be more proud of your achievements. You are a symbol of individuality to everyone here at the office. You listen to everyone with patience and deliver to the company’s needs. Your years of dedication towards work are used as an exceptional. I hope you know that you are a role model of a perfect employee.
The way you worked passionately all these years is excellent. Your positive vibe and the energy that you bring to this office is what make us hold our head high with pride. Cheers to one of the best workers in this office. Best wishes for your future.