Just some suggestions from a solo player.
Make dungeons like Shattered Throne, Prophecy, etc. have the option to be match made.
Tone down things like Presage initial runs - not but a whole lot but by at least enough so you don't have to be a career player to make it through. Kind of like how the old strikes used to be solo story missions but then turned into strikes? Yeah - that. Or have them be able to be match made too.
Basically - don't lock solo players out of content that isn't a raid. I get that raids are hours upon hours long, extremely complex, take a lot of coordination etc. Kind of on the right track with the "freelance" deals, attempting to make it more inclusive for solo players.
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You know how you made this post? The site/app that you just did that on also has find a fireteam. Use it.