Changing the Domain Name on my Multisite

My original multisite crashed and so I recreated the entire site on a new server using the domain name https://www.TheDigitalHorse.club. It works beautifully and now I would like to redirect my old domain to the newly created site. https://www.TheDigitalHorse.com.

The new site that I created has the main site .club
1. https://www.TheDigitalHorse.club
2. the membership area: https://www.thedigitalhorse.club/membersonly/ 3. the store: https://www.thedigitalhorse.club/store/

now I want it to be .com
1. https://www.TheDigitalHorse.com
2. the membership area: https://www.thedigitalhorse.com/membersonly/ 3. the store: https://www.thedigitalhorse.com/store/

I am not sure how to do this can anyone provide some ideas and suggestions or a developer I can pay to make this happen seamlessly.

Thanks

Robin