The increase in disk space？
I can increase the disk space for me to the host?
You can increase your droplet's disk space by taking a snapshot of it, destroying it, and creating a new droplet off of the snapshot. See How To Resize Droplets Using Snapshots.
This tutorial covers how to manually migrate droplets between hypervisors by taking a snapshot of the droplet and then spinning it up in a large or smaller size.
Given I understand your question. The answer is Yes, you can increase/resize your server resources.
https://www.digitalocean.com/community/tutorials/how-to-resize-your-droplets-on-digitalocean