Depends how exactly we define remembering. I expect many will understand what I mean. There are so many layers. For some people memory does hit them like a freight train, all at once like a movie of 24/7 flashbacks. That was not the case for me. When did I have the first glimmer of suspicion? Sometime in my mid 30s. I checked it with someone who invalidated what I was sensing, then stopped thinking about it for years.
The next phase started in 2013. I was 42. It went on for a couple more years. It started with a vague intuitive sense, then more and more things I was feeling matching what other people talked about feeling, then looking at my life and realizing how much of my story didn't make sense any other way. Then I started paying attention to what my body was telling me. That was a big turning point. I read everything I could find on somatic experiencing, body memories and somatic flashbacks. My flashbacks are rarely visual, mostly somatic and emotional, so that was important. The more I leaned in to my body's memory, the more clear it became that there was a "there" there. I mean, I would focus on a somatic symptom I was having and my body would tell the story in flashbacks so intense, it was obvious I wasn't imagining things.
I started getting clues in my dreams.
In my case, I am a ritual abuse survivor as well. My first clear memory of that came in 2013. I still don't remember everything, but enough to have a sense of my life story that makes sense and has allowed me to process my trauma and establish communication between different parts (which I didn't realize I had until 2016). The shame and self-loathing that come with thinking there has to be more but you can't remember it so you doubt yourself, is a minor thing in my life compared to where I was 10 years ago.
If someone just starting out asked me for advice, I'd say two things. First, be sure you really want to know. If your life is basically good as it is, really think about it. Remembering is not an easy road. Your whole life turns inside out and upside down, you lose relationships, you question everything you thought you knew, and you are shaken to the core.
But, if the answer is still "yes, I want to know" then my top piece of advice would be "trust your body."
It's the middle of the night and my eyes are tired and I haven't read the whole thread. Will catch up later.