Coins that are not pumped up and underappreciated are because the team itself is still lacking in fighting for their own products in the market so that they are better known to the public because now every team must be smart in making attention to every investor so that their products can sell quickly in cryptocurrency.
a lot of coins and tokens were under valued at some point, and they ended up in top 20, so I don't think what you said makes sense at all, maybe for some tokens but not all
We know that but the question is can you find them? Can you invest in those coins that have high potential when their price is low and hold those coins until they reach a high position on the market cap list? And most people cannot do this, and the reason is the huge number of coins that we have in the market, if the proportion of good projects to bad projects is something like one to one hundred then the risk that you are taking is too high as you will need the coin to do a 100x just to have a decent ratio of risk versus reward.