Do you mean you don’t remember them in great detail or not at all? Some details will always be lost over time, but if you use the places that are easy for you to remember in the first place, it will be much easier especially for long term palaces. What helped me for long term palaces, was creating them a week prior to actually using them for the information I need to memorize. Then reviewing the palaces from memory before putting the information there and just stick with what’s in my memory (not actually looking at the real place again), so I can make sure I only use the locations in the palace, that I remember effortlessly. When I put the information there I review it with spaced repetition which is very important in my opinion (you can find my personal review schedule here: Long term memory palace - #3 by SilvioB , of course there are other schedules; you can find some on the wiki or by searching the forum)
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