Maybe try reading using a speed reading app. I use Comfort Reader [0]. When the words fly by really fast you have to stop sounding the words in your head or won't be able to read the full sentence. For me thinking is like writing and reading to myself so it helps.

[0] https://f-droid.org/en/packages/com.mschlauch.comfortreader/

I sometimes do a mini meditation, quietly ignore the stream and it goes away. Or sometimes I try the opposite, forcefully suppress it.

I find that both have kinda the same effect -- all useful thought process get interrupted, including the abstract part.. :/