How much do you have done?
How much coordinating/matching fabric do you have left?
How much unsewing are you willing to do?
How much "tolerance" do you have for "design recalculations"?
Some of us would write the whole thing off as a learning experience and dump it in the wastebasket.
Some of us would pick it all apart and recut all the pieces.
I have a thoughy about the pressing - but I need to check it out to see if it would really work. In my head, it does. Not so sure if it will work in fabric.
The thought is to "spin" the pressing on the pinwheel parts - and then attach the corner pieces.
Sew the triangles together, and then press, "Spinning" one set going one way and the other set the opposite direction.
Then attach the corner pieces. And then press one set of corners towards the center, and press the corners away from the centers on the other set.
Here is a video about "spinning" a block:
https://www.google.com/search?client...hVKQ80KHRkqBV4
Another one:
https://www.youtube.com/watch?v=OK7PvSuASf0
When opening a seam to the stitching line, I do not cut the thread - I leave it at least one-fourth one inch long.