I agree with Scribbler, that there’s unfortunately nothing we can do to draw memories out that doesn’t run the risk of creating false memories (we like to trust our memories, but man, its not great and it’s so malleable, haha).
EMDR uses existing memories and has some empirical support as a treatment for trauma related conditions. In doing trauma work, people can remember forgotten things, so things may be recalled, but it’s not the goal of that work.
ETA: the things that trigger recall of forgotten memories is so person-specific and hard to predict. For someone, it might be a smell or a sound or something else small, and all of a sudden they remember that smell from an event in their past and the memory of an event comes back. Actually smell and memory are fairly closely tied, so that might not be such a strange one!