Stop reading.
Only Photoread or pictureread books upside down and backwards.
Occupy 'sub-vocalization' with chanting.
Organize your chanting dialog along some theme that is logical psychologically. That is whole and complete to itself and makes clear sense to you.
Basically, do not sub-vocalize any statement you are not prepared to 'live, eat and endure'.
Keep a log; a clear record in a notebook for same. When you stop keeping records, 'you lose'. Fill the notebook up and you win!!
And all this advice is still the 'tip of iceberg' as it were.