My experience of being a reader, since i was in highschool is also kindly hard for me. Mapa libro o ebook, nahihirapan akong intindihin kaya habang nagtatagal ay tinatamad na ko magbasa lalo kung nawawala na ko sa storyline. What I've do is just try to understand every single word, every passage and every context na bago sa akin. If you find words na hindi mo alam ang meaning, or yung mga words na malalalim, just made a little research i.e sa merriam webster. Kuha ka dun ng idea kung ano yung words na yon, or also if you find hard to understand such an one word, intindihin mo mabuti ang sentence kasi nandun na din ang meaning nun, yun bang may hints na.
I also suggest na maglista ka ng mga deep words na nalalaman mo sa context, find the meaning and try to memorize or tandaan mo lang lagi. Mahirap sa una pero believe me may progress ka nyan.
I also suggest na before ka magbasa basa ng mga books or long context books, try mo din magbasa basa ng mga shorts story para mas madaling intindihin at mapapractice ka pa.
Make reading books, watching docu, reading articles as your hobby, para ma enhance ang English vocabulary mo
Yun lang para sakin, goodluck ts.