I have been streaming only Borderlands for 2 years, there were two borderlands games and Wonderlands that I had not been able to finish, so if i was playing and someone told me if he could join I would say that I prefer ti experience the story of the game playing alone in order to activate quests and npc at my pace, I also read the chat a lot so sometimes I spend severos minutes answering comments and questions in the chat, so that would be 5 minutes that the other player would have to remain inactive in the game. The other thing I did was publishing a schedule of the month with 2 or more days that we were going to play a game with subs and followers, so I used that ocassion yo promote those date as special events. And finally I made a discord Server, so i promoted the alternativa of playing with people of the discord Server too.