In 2019, U.S. Senators voted 56-38 to approve Cella as ambassador to Fiji, an archipelago of more than 300 islands northeast of New Zealand, as well as the republics of Kiribati and Nauru, the kingdom of Tonga and Tuvalu. Cella's home state of Michigan, and it's Senators Debbie Stabenow and Gary Peters voted no, along with most other Democrats in the chamber. Cella's nomination was approved 14-7 by the Senate Foreign Relations Committee in April, with seven Democrats voting no. During the COVID-19 Pandemic, Cella was able to get an additional US$9.9 million for his ambassadorial countries, through the United States Agency for International Development. Its original USAID funding was US$2.3 million, bringing it now to US$12.2 million. A 430% increase in funding. He has also been involved in on the ground charity work, helping the Fijian Competition and Consumer Commission, during the pandemic. Cella's embassy has made donations to food banks that help people, and families impacted by COVID-19. Cella was also able to help the Fiji Red Cross Society set up a blood drive. He was their first ever blood donor. During Ramadan and the COVID-19 Pandemic, he made this statement:  Cella has also made talks with Attorney General and Minister of the Economy Aiyaz Sayed-Khaiyum, the State Department, and the state of Texas, for having more bilateral trade opportunities, and for stimulating business and investment with the country of Fiji. On June 22, 2020, Cella signed a grant with the Women Entrepreneurs Business Council (WEBC) to run the Academy of Women Entrepreneurs (AWE) for 60 to 90 Fijian women business owners. The grant will allow for trained facilitators from WEBC and the Makoi Women’s Vocational Center to guide women business owners through a training program. The facilitators, who are also local business experts, will lead sessions in vital areas of entrepreneurship and business management while addressing Fiji-specific topics useful to entrepreneurs. In 2004, Cella founded the National Catholic Prayer Breakfast along with, Rick Santorum, and Leonard Leo. Which was created in response to Pope John Paul II's call for a new evangelization. It has featured many notable guest speakers like, President George W. Bush, Chief Justice John Roberts, Paul Ryan, Raymond Leo Burke, Samuel Alito, and Antonin Scalia.