At any point, did you change the IP address associated with your domain to a droplet built from the image transferred to you? You’d need to do these two things:

1. Use the image (a snapshot of the previous virtual server’s disk image) to create a new droplet. This tutorial, in the section “Receiving a Snapshot”, discusses the process of doing so:
   https://www.digitalocean.com/community/tutorials/transferring-a-digitalocean-snapshot-to-a-different-user-or-team

2. After you have created this new virtual server, you will then need to note its IP address, which you will then need to point your domain to with an A record at your current DNS provider. Your domain’s authority has been delegated to these nameservers:

   ns43.domaincontrol.com
   ns44.domaincontrol.com
   

   Source: https://www.whatsmydns.net/#NS/sisinvestigations.net

The additional link shows the IP address where your domain currently points to:

https://www.whatsmydns.net/#A/sisinvestigations.net

Hope that helps!