Hmmm... I'm not sure why it's telling you that you have too many recipients, since Airtable limits you to 100 and that is within Gmail's email sending limits.
Although I noticed that Gmails's sending limits also includes a daily limit of 500 people per day, so maybe you've hit the daily limit? Although I would imagine that Gmail would give you a different error message if you hit a daily limit. But maybe it's the same error message.
You can always try increasing your daily limits by upgrading to a paid Google Workspace, which has these increased limits. That might fix the problem, but I'm not sure.
Alternatively, you might want to loop through your recipients in Airtable's Automations using Airtable's repeating groups of automation actions. That might solve the problem, because it will only send to one person per email, instead of 100 people per email.
If all else fails, you may want to automate this with Make's Gmail automations. (There can be a bit of a learning curve with Make, which is why I created these training resources for Make. If you need to instantly trigger your Make scenarios from Airtable instead of triggering them on a recurring schedule, check out this thread.)
Even better, you can use any professional email service that you'd like to use with Make to remove any limitations that Google might be imposing upon you. For example, you can use their SendGrid automations or Outlook automations or MailGun automations or BigMailer automations or Mailchimp Transactional Emails or whatever email service you’d like to use.
There are no inherent limitations when sending emails with Make, except for any limitations the email sending company may impose on you due to your pricing plan with them. The ones I listed above have greater limits than Google.
