Check the shared host limits, mainly the memory allocated and see if it's above 1GB. It all depends on the amount of plugins you have enabled in each site. I'd say it would probably be able to handle them but if not, you could always resize the droplet. Here's more info on that https://www.digitalocean.com/docs/droplets/how-to/resize/ . It seems that you have 2 options, permanent and flexible. Permanent would resize the disk, cpu and memory, which is irreversible. Flexible would only resize the CPU and memory and you can always go back to the original set'up.