Here are my thoughts on this. I'm just typing what I'm thinking. The answer is somewhere in here, and its not a 'here do this' kind of solution. Because it can't be that simple.
Its very long: get ready for a ride. But the read is worth it, I promise
Ok so everything resets. Any physical amendment, any environmental changes, etc. This means there is no 'external' solution to this one. Anything affected by time as we know it can't be the solution. This led me to think of two things: the solution either lies in something that is 1) unaffected by time, or 2) it is affected by time, but unlike as as we perceive it. Let me explain what this means.
Time is not a real quantity. It is a concept. A concept is a mental structure in which we associate things with each other: a source and a target (take note). To alter the concept of time and memory, you have 2 potential options.
One is the source: the brain itself. There are various centers in the brain involved in memory formation, (specifically the hippocampus and associated structures --- read up on Papez circuit if you wish to go into details of this), which have a wonderful ability to 'trap' a piece of time and store it. This is called a memory. Sounds beautiful doesn't it?
If you alter the brain, you are changing time as we perceive it (as noted above). Hence this is a potential hole in the loop.
The other is the target: the sun/moon. This is what mankind uses to perceive time. I'm talking about solar/lunar calendars, the concept of a 'day', a 'month', a 'year'. These are all dependent on the movements of the sun and moon, eg: rising and setting of the sun, solar and lunar eclipses, full/half moon cycles, etc. If you alter the sun/moon somehow, you can send a message because these are unaffected by time. In fact they are targets mankind uses to create time. So technically controlling them will control time. Thus, this is the second potential hole in the loop.
Both of these are two extremes of the spectrum of a 'concept' called time. The source and the target.
So we have narrowed it down to this. Next we have to decide which path to take. Looking at the capability of a human being, resources available, and the time interval in which we can make changes after realizing (you say its a day, right?), the best choice seems to be the source. Altering the sun/moon in any way is beyond human capability and nothing can be done in a day
So we alter the brain. How? Well like I said, the solution can't be external. You can't just insert a device in the brain to alter memory formation. Then what?
I mentioned the hippocampus and Papez circuit earlier. There is a beautiful natural method of creating and storing memories in time. Now what you have to realize is that only humans have such an elaborate mental structure. No other species or form of life does. What does this mean? It means that just like we see life with less elaborate mental structures, there must definitely be potential to create or BECOME a more elaborate mental structure! One that possibly allows to alter the entire concept of memory formation and time in such a way that your 'past' self can 'recall' things... from the 'future'... which is currently your 'present'... 😮
Yes sure call this absurd all you want. I'm sure if a goat told another goat, "hey you know maybe we can talk and write one day", the other goat would laugh. And that is because it is impossible to comprehend or imagine what the beautiful mind has the capability to do. That is what 'the true potential of our minds is untapped and locked' means after all. Once you unlock that capability, you can do things that previously you thought were 100% impossible.
So that is the answer. You have to unlock the capability to do so, in that one-day time interval. I cannot tell you how to do it because like I said, it is beyond comprehension and imagination. Our minds cannot perceive such a concept yet. But it can happen one day, from within.