Another automation service that doesn’t get nearly enough mention (in my humble opinion!) is Integromat - it’s hugely flexible, and much cheaper than Zapier. I’ve used it for everything from Hubspot CRM integrations, to Webflow/Memberstack/Airtable builds.
Full disclosure - the link above is a referral link. Although of course hugely appreciated if you sign up using it, here’s the direct (non-referral) link for you if you prefer - www.integromat.com.
For your use-case, you could set up a workflow that watches for edits to your Google Sheets data, and then automatically pushes that update through to the relevant CMS item (as it looks like you’ve already identified would be the case if you used Zapier). There is a bit of a steeper learning curve attached to it, but definitely worth putting the time in to learn it, in my opinion - even just their Free plan is pretty powerful, and their paid plans start from $9/month vs Zapier’s $25/month.
Feel free to drop me a line if you get stuck - I’m certainly no expert, but can do my best to troubleshoot for you.