How to reduce server load?

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    Hi, I have a server with my friends but the thing is lately when I try to start the server a message shows that says "CRASHED: Server crashed because it ran out of memory. Try reducing the load to avoid crashes like this in the future." I don´t have any plugins nor mods installed in my server, there's only 5 players incluiding me into the server, can someone tell me what can I do, please? :,)