I had this idea upon waking in the morning. The idea is that Monolith’s could use a little bit more of a way to farm certain items, one way to do this could be by adding onto a existing system like blessings or creating something new like a mix between idols/blessings but that change the way your Monoliths rewards at the end roll/rarity and other things.
For example what I was thinking was something that gives you a higher chance of getting maybe Exalted Axes to roll in your monolith as an end reward, or set items, or whatever so you can spec into farming Monoliths and getting better end rewards that you are looking for, because to me going a certain path on sentinel and getting a rare bow node feels bad 
. But that system could be expanded to either include something like giving either more flat rarity to your Monoliths, or more rarity per echo done in a certain Monolith? Some way of scaling that it doesn’t get to be too much. Those are just somethings that could be added to kind of add to Monoliths.
I’d say Monoliths are already pretty fun to do, but maybe adding a way to specialize your Monolith’s to give certain end rewards not only from blessings, although blessings work as a finding increase in all areas, I think, rather than targeting the end rewards of an echo.