Using raspberry pi as a ☁️ VM?

Hi there👋👋, Community. I am thinking to buy a raspberry pi sooner or later, cuz I am thinking to use it as a cloud storage option and for using it as a cloud VM, just like we do in aws, azure or digital ocean or even linode(i think you all got my point😁😁.)But the problem here is I know how to use it as a ☁️ storage, but don’t know how do I do the same with ☁️ VM, I know that I just need 3 things for that-network,battery and ssh, but the problem here is that what if I want to distribute the 8gb RAM of raspberry pi into two 4gb RAM VM’s, like running two instances of ubuntu on 8gb raspberry pi, with first using 4gigs and the second is also using 4gb, how can I do that? Any help would appreciated!