Even with a large clan alliance on Discord it's hard to find people who want to to a particular activity at any time. All activities should have matchmaking and have a way to set your game in "Solo" or "Fireteam Only" mode. And I mean every one. Start an advenure, get matchmade. Go to kill Gravetide Summoner, get matchmade. Start a nightfall, get matchmade. Start EP, get matchmade, start a Blind Well, get matchmade, enter an Ascendent challenge, get matchmade etc. And for the truly brave yes even start a raid and get matchmade. All of this should be on by default unless you indicate that you want to play alone or with your pre-chosen fireteam. Will you from time to time be matched with people who struggle with the activity? Sure, but if that bothers you just go make fireteam as today.