The value of a coin goes up because of trust, Luna has lost the trust of the entire market there is no reason for it to come back. Team Luna and Do kwon are able to create a new version of Luna but the people who will continue to hold the coin have scammed people before.
Many investors are thinking like you, Luna is very low and a good opportunity to buy but who pumped money into hype Luna to get you guys out. No shark or developer is that stupid, buying Luna now only makes you a liquidity pool for the Luna team.
It's not just trust that makes it go up, it is basically just something that would be a bit of a problem that would be an issue and if there is no problem then it would be a great deal. I personally believe that trust is important but the "belief" that it will go up is more important.
It's a cycle, people think it will go up, they buy it, and it goes up, and they think they are right and reinvest a bit more and it keeps going like that for a while before it reaches the peak. So trust is important but I have seen plenty of stuff like shiba that is not trustworthy but people invested because they think they could make money, if people think they could make money, then they would invest into untrustworthy stuff as well.