Is there a way to send invitation emails only to specific participants?

In fact, it is very desirable that you send the invitations mainly to people who match your inclusion criteria.
To do this, select “Assign participants” in your experiment.
Before displaying all participants, you can select filter criteria via “+ Add condition”, e.g. a specific entry in the “Gender” field.
Subsequently, only participants that match these criteria will be displayed via “Search and display”.