It does not look like the Lunorian theme is abandoned and buggy. It has had no updates since 2017-09-19.
So changing to a new theme that is being maintained might be better. The Cerulean theme look similar and might be less buggy.
Or one of the many other forum themes could be used, changing the secondary color to blue likely isn't too hard, as long as the main color is black you should be ok.
See: https://community.mybb.com/mods.php?acti...ory=themes
Alternatively you can ask someone in the community to help with making a custom theme.
So changing to a new theme that is being maintained might be better. The Cerulean theme look similar and might be less buggy.
Or one of the many other forum themes could be used, changing the secondary color to blue likely isn't too hard, as long as the main color is black you should be ok.
See: https://community.mybb.com/mods.php?acti...ory=themes
Alternatively you can ask someone in the community to help with making a custom theme.