[Jotaku]

Of course you can solo in solo mode, but I understand that it's kinds of boring since teamfight is never allowed there.
Therefore, if you frequently solo on squad, you will need to utilize it a lot in order to avoid unfair cases.

You can only leave the game without penalty if you leave while in waiting room. You don't have to leave immediately even if there is no allies. Wait until counter goes below 10 seconds left. If luck you will get other 2 people. If not luck, you can then leave if no one still joins.

By repeating this you will somehow get teammates.

However, make sure that there is a chance that the game will forcibly put you into solo "after the game started".
In that case you will anyways get penalty when you leave. But I see this case happens very rarely, especially when there is no other players.

And finally never goes to Ayumi Castle as soon as the game started. That area is where full of premade parties go to.