There are always opportunities like ARCH available. It all boils down to your skill as a trader to uncover and exploit these opportunities before the rest of the participants in the market.

All of the answers to your questions regarding price movement, can be answered simply by carefully analysing the price charts for what I call 'percentage patterns.' Throughout my research of the altcoin market, I have found that each and every coin that is available for trading, has 'several' recurring percentage patterns.

There are coins that rally once every month... There are coins that rally once bi-monthly, and there are coins that rally twice a month. The 'most' telling factor in each one of these scenarios that completely exposes the most optimal buying price is the % decline that occurs after each of these rallies.

The ability for BTC to be liquidated from an altcoin relies heavily upon public interest - and also herd psychology.

If you were to study the orders on the buy side of a coin, you will see that people tend to place their buy orders in price ranges that already contain existing orders - people will rarely put buy orders into extremely low price ranges simply because they assume that their order will never be hit if they were to do that... so when people aren't sure what to do, what happens?  - they follow the crowd. Therefore they put their buys in amongst the cluster of orders that have already been placed by other traders.

This is what forms "the bottom" or "the floor" ...

Each and every coin has it's own "floor," where traders place their buy orders due to this psychological influence of social proof.

You see, when ever you have a collection of human beings buying / selling an asset, there will always be prevailing patterns of movement and all of these patterns are exposed on the charts.

By looking at the % decline that occurs after every rally, you are able to expose where the "bottom" is in any coin that you're trading.

For instance, some coins tend to rally, then decline -70%... then rally again, then decline by -70%... then rally once more, and decline by -70%.... The % decline will vary from coin to coin... some coins will repeatedly drop -85% after a rally, or -60% or -90%, the point is, these patterns occur in every coin in this market, which makes the % decline a very powerful tool that you can use to your advantage.

Also you need to be conscious of the fact that some coins can shed value, and never rise again, but if you read through my posts (particularly this one)you will see that you can very easily separate these coins from the strongest performers in the market - and there are a whole lot of strong performers.

Most crypto traders will never win - simply because they don't understand why / how a market moves. So they are always "scared."

But the exploitation of 'percentage patterns' will allow you to make serious amounts of money in crypto.