The second season actually chose a time perspective, that is, the thoughts and actions of "wanting to change the past", which are the key to the occurrence of past events. From Jonah persuading his father not to commit suicide, to the female factory manager preventing his father's death on June 26, the screenwriter's intention has been confirmed.
I think Jonah can only avoid the end of the world he caused by committing suicide before he crosses, like Killer in the Ring. And it can only be suicide at the time, the future Jonah can't kill the former self. I think "without" Jonah's timeline should look like this. It's not that it hasn't been at all, but it hasn't been since some point in time.
Also from Jonah's different perspectives it can be seen that this is one of at least two cycles. The young Jonah went back to persuade Mikael not to commit suicide, so that he knew that he would not go back and send the young Mitchell to the past in the future. Middle-aged Jonah does different things in different timelines. The first one to go back, was found by Martha, told Martha his identity, kissed, and finally Martha knew that Jonah was a nephew. The second one went back and knocked on the door, and said to Martha, "You may not believe it but..." He didn't know the first one's actions, indicating that the second action came first, and then the first one. Then pulled into the house and made out with Martha only to be pushed away saying it couldn't be done. The third goes back and kills Martha. The three middle-aged Jonahs had different information. The last one clearly has a qualitative change.
There are still a lot of puzzles left in the second season, let's see how the final season of the third season will be compiled.
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