Don’t include “Noob friendly” or something of that sort in your descriptive text.
Many hackers like to just ruin everyones day and they tend to be more present on noob servers, because noobs are easier to grief than experienced players.
Include “Fresh wiped” or similar in the description. New players are searching for a good starting point and avoid servers where 10x10x50 bases exist all over the map.
Pay attention to your userbase, but also show authority if necessary. If someone yells and yells to gain attention, warn him and kick him if he doesn’t change his behaviour. Same with constant flaming between players because of someone shot someone or something. Make clear rules and enforce them, like english only in chat or no building inside radtown.
Ask about problems/suggestions from time to time. Our admin switched the backpack lock on and after 2 days asked around if he should keep it or not.
In terms of parameters, set decay to a reasonable amount of time. The server tends to lag more as more buildings are built. Because of the fluctuation, there are always more than 25% unhabited buildings that should be removed as soon as possible.
Help new players, but keep the help to a minimum. Like it’s okay to guide players to each other, give them food and cloth but it’s not okay to give a new player explosives and c4 for research and teleport someone because he fell inside a canyon and doesn’t want to lose his loot.
Look out for bullies. It’s okay to kill on sight and raid, that’s the game. It’s not okay to camp in front of someones base for hours, flame over voice and shoot that person dead whenever he tries to get out.
Also, events and giveaways for long-time players. Our admin gave us “one shitty car on top of our base” per player that was on the server for more than 5 days. After 10 days, each player also got a premium kit with armor and weapons. Once.
These are all just examples, but maybe some of them help