I have(had) an ok reading speed, and I could read couple of hundred pages of fiction and 20-50 pages of non-fiction in a stretch. Now I struggle to attain such

I have(had) an ok reading speed, and I could read couple of hundred pages of fiction and 20-50 pages of non-fiction in a stretch. Now I struggle to attain such sittings, maybe because age or habits have moulded my brain to get distracted easily. One thing I have found to help is merging audio/textual reading. I enable tts in Kindle app or Edge reader mode and try to read along as I listen, this enables to me to have 30-60 min sessions without getting distracted. It is slower than my absolute reading speed, but I get more in a single sitting.