If I try to step back and look at the bigger picture, 40,000ft view. I can confidently say that Q is a psychological operation conducted by military and/or government officials with high clearance that Trump is aware of and has not renounced. It would also seem that Scavino is also somewhat involved based on posts and their timing.
As to the purpose, I would say it is to sway public opinion and provide some sort of direction for those seeking answers and truth. To give clues into the corruption that plagues the current governments of the world, especially the US. To what end, I do not know. My opinion is that the country needs something to unite it again, somewhat like the events of 9/11 united us. That leads me to believe that we all have to experience some kind of massive national/worldwide trauma or difficult period together where everyone feels it, to the extent that political alliance and divisive issues seem meaningless in comparison. Looking for opinions, I want to believe that Covid was that necessary event but people are still far from united. Do you think the eventual revelations of vaccine damages and the intentional release of the virus will be enough or are we still in for another period of some new pandemic/war before the dawn?
I'll go with what Q said, crimes against children will unite humanity. There's no putting that cat back in the bag.