Mr EGFC,
I play solo a lot and you are welcome to friend me. Graydoc on PS4. But if you want to do the Nightfall, Weekly, etc., the best way is to start sending out friend requests a LOT. And the best way to find good, compatible players, is to do the strike playlist. Sometimes you can do several strikes in a row with a really good group of three. So, send those two guys a friend request. Soon, you might find you have a lot of friends online when you are and you'll have an easier time getting in a group for a weekly or Nightfall, etc.
Thats not the point a game should not require you to find people to finish it it lets you do solo missions so it should be possible to do it solo and not an endless grind, Destiny 2 has all of these problems still, looks like bungie didn't learn anything, Nightfall strikes are impossible to do alone unless your a really pro player with maxed out levels. Solo players like to do thing alone and should not be punished for doing so even campaign strikes on destiny 2 are more difficult than they need to be.