For mini-games such as sky wars and egg wars, being able to vote for the map you play on instead of buying a rank to choose a map might appeal to players that can't afford a rank. For example, giving an option of four or five different maps and allowing players to click their preferred choice and the map with the most votes is chosen to play on. Other large minecraft servers have done this and player activity has increased on their servers.
Another suggestion is adding a bundle to the CubeCraft store that specifically allows players to vote (For overpowered items, health levels, throwables, night or daytime, etc.). This can already be done when buying the rank "Gold" or above, but buying ranks also comes with lots of other perks such as access to the /report command and extra friend slots. Being able to solely buy the ability to vote for a cheaper price might appeal to a lot of players.
Another suggestion is adding a bundle to the CubeCraft store that specifically allows players to vote (For overpowered items, health levels, throwables, night or daytime, etc.). This can already be done when buying the rank "Gold" or above, but buying ranks also comes with lots of other perks such as access to the /report command and extra friend slots. Being able to solely buy the ability to vote for a cheaper price might appeal to a lot of players.