You can think of images or even actions that are more natural to you(personally) and which are good with the text which is encoded or being encoded as having both text and images that are good with each other will strengthen your memories(Ex-Your memory of the set of numbers which you are trying to memorize) as using more than one type of memory together boosts speed and recall(Ex- Emotional Memory and Visual Memory(Memory of the things that were said in a lecture which can be converted into a textual form) Verbal Memory and Textual Memory(The Memory of Texts),Spatial Memory and Visual Memory(Memory Palace)… etc.
And I think that this method works well for longer information,
When chunking people seperate the distance between chunks in a fixed format for numbers at least however @DanielTimmis(Sorry if this name is incorrect) A memory champion and a human calculator chunks numbers by the numbers or I think sets of numbers and Chunking numbers that way along with the distance with the numbers of the chunks based on the distance of the other chunks is extremely effective and with practice it can become Super Chunking(It also more than doubles your memory if you use the full potential of the human brain),
I think that most of the memory athletes do not use the full potential of their human brains when memorizing,A study was conducted which showed that when highly performant and average learners were given numbers to memorize the highly perforant learners memorized more information but they stored or encoded lesser information which was surprising but it might be because those people were either nearly expert learners or expert learners and their learning became automatic or nearly automatic but then they stopped improving because of that,they did not challange themselves and did things which they could had not done before when memorizing(or for another example-Writing with a non dominiant hand or brushing with that hand!), I think that this is one of the reasons which caused the areas of the brain responsible for memory and congnition to reduce their activity(because energy is a precious resourse and it was not so needed after learning and practicing The Memory Palace rigorously or not rigorously ,
And because enegy is a precious resource and their brains must have thought it beneficial to become more efficient and our brains or in this case their brains also had the means to do so(They had learnt The Memory Palace and had also practiced it!),
People nowadays do the same with their spiatal and visual memory(I think not as much with their visual memory) and they really operate below capacity when using The Memory palace deliblately consiously and uncounsiously forgetting some details which may not be important then but will become important during our recall) and the same thing happens with our emotional memory we consiously forget the extra information on how people made us feel or the information which is not needed or we think we will not need but we can remember them without great difficulty and overtime this will happen on autopilot and will become effortless for us and will automatically improve the memory of a person who thinks that he or she has a poor memory and our overall memories(or memory) is better than we think,That person will be able to remember more emotional and spatial events I think that they need to pay attention,focus and create a need for remembering the spatial and emotional information(and check their memory in their visual,spatial… memory,The wording of the sentence in bold can be changed,thought and followed for the things that are effective for you personally and one or more extra words have been highlighted with the bold formatting to prevent you from making mistakes that will give you lesser gain than the correct implementation of the wording itself),
Have a Great Day.