As others have said, you probably have no idea as to how very loud television is. And, how very disturbing that we could be for neighbours.
Thanks to technology there is a lot you can do, obviously, first stage is hearing aids. I wear these all day every day in both ears. Do not put them in until after I am dressed each day, so at brekkie have the tv in my Living Room on very loud. When I turn it back on later int he day when my aids are in place I am always astonished as to how loud it actually is.
Secondly a sound bar on your television, can make the sound much sharper and therefore no needing to be loud. Obviously sub titles are important. I can always 'hear'
better with sub-titles than without them.
You can get a wired system from the deaf society to be put in your room, which will assist your hearing of television.
You can also purchase wireless headphones, which would mean that ONLY you could hear the tv. Worthwhile investing in these.
Drop a note to your neighbour apologising for problems in the past, and saying that they only needed to talk to you about them, rather than going to the Council. Also let them know what you are putting in place to prevent problems in the future.