What do you think of Friendica? It only needs PHP and a database.
Fediverse
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https://aussie.zone/post/21093
Couple hundred users and it's running on 8GB RAM, 4 vCPU, 160GB NVME storage. Which according to OVH Sydney is about AU$10/m
But that doesn't include the the Pict-rs media store so keep that in mind for your storage numbers.
For a single user instance (or friends - family) pretty much anything will do.
Consider also ease of administration, upgrade smoothness. It vary quite a lot depending on the stack and maturity of instances flavors.