Google Workspace YAMM Email Automation

I run all company email from Google Workspace and now want Yet Another Mail Merge (YAMM) to be integrated to my google Workspace Email, so that I can push out a daily emails sending of approx 500-1000 — each message may include short text plus one or two small attachments... (Budget: ₹600 - ₹1500 INR, Jobs: Email Marketing, Google Sheets, OAuth)