So it is apparent that tps is a large issue on the voltz servers, it is bothersome to players and has turned away some new players.
A big potential cause for high tps is chunk loading via anchor upgrades inside digital miners.
There are, or at least could be developed, plugins for chunk loading. So players can use that instead of anchor upgrades, which can a banned item. Perhaps the plugin could have maintenance cost for players that increases with the number of chunks loaded. In addition to this, you could perhaps make the plugin remove the chunk loading after an inactivity period. I know such plugins already exist on modded servers however I am not sure of the public availability of them.
This would greatly reduce the number of chunks loaded and somewhat scale the number of chunks loaded to the number of active players instead of all both active and inactive players.
Lemme know if you have any further questions.