Some things aren't ment for solo players like Raids and Trials because it can require a fair bit if communication. Sure, people find ways around that to challenge themselves, but those are the same people that would frequently run these activities together so they get into a rhythm and have a system of how things are done and who is doing what. I've notice the seasonal public event tries to instance spawn people into active events. Plenty of times I've started it solo or with 1 other fireteam member and within 5 minutes I've seen 2 or 3 other people show up out of nowhere. Its not impossible, even for a responsible adult. Just figure out a gameplan of what you want to work on and how much time you have to do it is all.