One week is a very short time for crypto investment. You really have to need some sort of a good technical analysis or a chart reading so that you will be able to invest soundly in the right coin. We cannot just easily guess which coin will rise or not in the next 7 days or a single week. In the absence of all these technicalities regarding trading, then perhaps you look for coins that are usually swinging high and low and the enter during the low point.