I did some calculations trying to predict the released date of Fighting Myself using HT20 as a reference:
She Couldn´t release date: 13th of August, 2020
In the End (demo) release date: 1st of October, 2020
HT20 release date: 9th of October, 2020
Time passed between the release of She Couldn´t and HT20: 57 days
In the End (demo) was released 49 days after She Couldn´t. That represents 85.96% of the total time between the release of She Couldn´t and HT20
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Lost released date: 10th of February, 2023
Meteora20 release date: 7th of April, 2023
Time between the release of Lost and the release date of Meteora20: 56 days
85.96% of 56 days is 48.14, so 48/49 days after Lost. That date is the 30th or 31st of March, wich is a thursday and a friday.
So, if this is correct, the release date of Fighting Myself will probably be the 31st of March
Edit: If Fighting Myself is the next single, we still don´t know that