In comparison to what
@superxsnap said, instead of resetting the current skyblock server where there are many people who have worked hard and spent a lot of time on their islands, wouldn't adding a secondary skyblock server be a better way of handling the situation? That way, the people who want to have a fresh start/clean slate and be in an environment of which everyone is
starting new, can go to the secondary skyblock server. And the people who have worked hard on their islands can stay on the current server.
Also, the "Afk" or "abandoned" islands temporary limited plug in idea sounds a little extreme when you say that people have about 4 weeks or so until an island is disposed because they haven't been on it within the given amount of time, instead of 4 weeks, how about a few months? Because people have things to do outside of Minecraft and its not like people will always have the time to go on just for that purpose of fear that they'll lose their island. If people have that big of a peeve of the lag on the current server, then like I said before, they can go to the new one which will have less lag then the current one. Lag isn't an issue for some people. It gets annoying yes, but I mean its tolerable enough if it means keeping everything you worked on for weeks/months or maybe even longer. (Apologies for any mistakes am typing this on my phone and it is very difficult)
@Sugabuga9