Install Debian on it and start playing with docker . For file shareing you could try OMV …

If you can add a bit more RAM id suggest to give ProxMox a go … but with just 8 u are gonna fill this up with just a single VM

I had no issues registering with zone.ee without any sort of Estonian ID and no longer pay a management fee.

you used the paypal method? how did this work?

what about zone.eu ? and they paypal singing thingy ?

ATTENTION: Application for .EE domain needs to be digitally signed. If you are unable to sign the application using ID-card, Mobile-ID or SMART-ID then you can authorize your order using PayPal Verified account. NB! Please make sure that your PayPal account name matches with the registrant's or it's administrative contact's name in the application.  

the " e-Residency program" that u/borouhin mentioned realy seems too complecated just to get a domain to “play around”