Development help with deprecated Node.js version 16

I'm looking for a developer to help with fixing an issue with my website. I’m a graphic design and have a simple portfolio website running on Sanity through Vercel. I’m unable to do any updates. I did a full redeployment and update to fix the deprecated Node.js problem but it's still not taking the updates. My developer is no longer available so I need some one to help with this issue.