Change DNS to new IP?
Please run putty or ssh and connect to your server with root then
Use "PEERDNS=no". This option will prevent /etc/resolv.conf from being modified by a DHCP server. So instead of using DHCP-provided DNS, you can specify any arbitrary DNS servers you want to use in /etc/resolv.conf.
The configuration file for your network interface (e.g., eth0) looks like the following.
sudo vi /etc/resolv.conf
Press enter for continue
for delete u can use of x button on keyboard and then ESC after it use i for edit .conf file and after edit click Esc and then type :wq for save changes
((for more help edit file please click here))
2. Move IP to new Droplet?
-login to digital ocean
Droplets--->click on the name of servers that you want to upgrade on downgrade it--->click on Destroy tab---->then click on Destroy blue button --->
After it you can create a new droplet just should select size ((everything that you want))+ same region*
Have a good day