World of Warcraft, World of Warcraft Classic, and SWG Legends are all MMORPG games that I essentially play by myself. My goal is for other players, who are starting out, can afford to buy materials, create things, and sell other things at a profit so they can buy items they need.
Charge unto others as you would have them charge unto you.
I don't care if other people ask for 15 gold for 20 stacks of copper bars. I ask for 3 silver because I can get 2 silver if I sell the same stack to a vendor. By the way, I've noticed no one is selling 20 stacks of copper for 15 gold anymore. 15 silver maybe. So I get a certain amount of joy disrupting the market.
But I don't message others or interact. In SWG Legends, people like me are the ire of so many players who believe only social players should play MMORPG. Ptui... I spit on their opinion.
In both, if I run into a situation where I am not powerful enough to solve, like killing a level 23 creature when I'm level 17, or infiltrating a group of level 17 creatures where their combined strength will defeat me, I wait until I'm a higher level, or I try to get smart how I attack. I'm not that smart, because I'm slow, but I sometimes get lucky. I'm unlikely to on any dungeons at my level.
Play Diablo IV the same, in terms of attacking monsters and demons, but it is a MMO game that doesn't seem to mind single player participation.
I play another game alone called DayZ. It is more of a challenge. It is very easy to die from starvation, dehydration, or zombie attack. I set up a server in case my sons feel like joining, and I don't have to worry about psychopath players. We use to play public servers, but some players are genuinely psychopaths. I once gave a player some water. They accepted it, thanked me, said I looked kind of cute, and then killed me. It was in game voice chat on their side. I sent text. I felt violated. I've also had people sneak up on me, knock me out, tape my hands together, wait for me to wake up, so they could knock me out again, over and over. Eventually, they shot me. Tell me that person does not have psychopathic tendencies. So now I just play on my server.
I use to play SCUM, but I got bored with the updates. The players can be very hostile, and form in-game gangs. I use to play it for the fun of just surviving. They've changed it to the point where it got restrictive and boring.