You can go to apply for your extension 30 days before your last day of the current stamp until that last day at most offices. But in your case, Maybe better to go to your local office as soon as possible to talk to them about your issue.
The police order is clear. It's "monthly income of no less than
*****
baht", not "around
*****
baht". Unfortunately, it has nothing to do with your extension application if you had this big amount transferred to Thailand before or not.
You need to contact wise and your bank to correct the record but it's out of the scope of this group.
If your record cannot be corrected, your choice might be to use the 800K baht banked money method.