Turning grass into lawn can be a real challenge with one of those temperamental 2-stroke lawnmowers.
The secret of getting it started everytime is in the correct turning-off: ignore those controls on the handlebar; they're there just to confuse you.
Turn the lawnmower off by shutting off the fuel supply! Simply turn the orange lever to the horizontal SHUT position and let the engine run itself dry!
To start again. point the orange lever downwards to the OPEN position, give the little black rubberball next to the fuel line a quick squeeze, pull the starter, and - PRESTO! - it works every time.
I thought you could benefit from this culmination of a lifetime of learning ☺