Change Response to Single Meeting Occurrence in Outlook

According to your description, I understand that you mistakenly deleted a single meeting in the recurring meeting and want to resume the meeting, right? If so, please refer to the following steps:

1.File>Options>Mail>Send messages>uncheck Delete meeting requests and notifications from inbox after responding;

2.Double click any remaining single meeting, and choose The entire series>OK;

3.Choose Change Response>Decline and Do Not Send a Response;

4.Open the original meeting invitation in your inbox, and choose "Accept" again with Do Not Send a Response.

Then the whole recurring meeting will be displayed in your inbox. Hope to help you!