I have a suggestion as you know many people are asking for campaigns why not try this make a lore video about how portal technology were invented and how SSL was founded if it receives well try to make a campaign of the factions based on that what motivates then and why do the participate in it like make a campaign how aeros won the SSL tornament
And as for solo players make a seperate section which has game modes like tdm for solo players to enjoy and not rely on objectives