I understand there are people who don’t want this playstyle of PvP and raiding, but please consider allowing visitable worlds where players who CHOOSE to opt-in to this playstyle can go and settle and fight with others / have wars, etc.
You could implement a system such that you can protect individual blocks with various degrees of strength by using different minerals or resources. I once played a modded game of Minecraft where you could protect 1 block with 1 Smoothstone and it’d have to be then broken 25 times to be destroyed, or 1 block with 1 iron to have it be broken 900 times, or with 1 diamond for 1800 times. This is a great system that means a lot of work put into protecting something and similarly a lot of work into destroying it.
This will bring a huge number of players like me to your game, while still being suitable for your current playerbase.