Most of us live in routines. Our lives are centered around having the same routine each day or each week. If we stray from that routine it can keep us from being able to remember things. Your routine is what is holding back your memory. Change how you do things each day to force your brain to develop new ways of remembering and sorting information.
If you are trying to remember a large list of items, try placing them in categories. For instance, if you are headed to the grocery store and have a number of items that you want to get while are there, mentally group them into categories such as meat, dairy, produce and grains. Breaking down big lists into smaller subcategories makes them far easier to remember.
Your library should have a good selection of books on memory improvement that you can borrow. Many psychiatrists have written books that help people improve memory. You might not need anything more than these books to help.