Your track plan is interesting. That inner portion would not need any reversing if not for the connections labelled 1-2 and 3-4. So, I don't know why you have two stars at the left and right ends. But, I can't read the tiny text otherwise, which might explain it.
I'd double gap (gap both rails) of the track between 1 and 2, and between 3 and 4. Then, I'd do the same for the track extending left from 4 and right from 1, somewhere out near the stars. They should be far enough away that your longest trains fit inside those tracks from 1 or 4 to their neighboring stars.?
I hope that's a reasonable requirement for your railroad? If not, then things will get complicated. But, if your trains and railroad meet that requirement,? you only will need one reverser or reversing switch, for the area between the two stars plus turnouts at 4 and at 1. There is no need to reverse the tracks leading left and right from the points labelled 2 and 3.
