That's up to you if you wanna get into ETH. Imho it's still too risky to buy it. I'd rather go long on ETC as it might starting to become more stable lately.
On STR, I have no idea. I personally tend to stay away when an altcoin becomes too volatile. Also keep in mind that I don't believe in making predictions in the market. All we can do is follow the price.
If there is absolutly no predictive power in technical analysis, we are in weither:
- weak efficiency hypothesis, all information endogeneous to the price is already priced in, no point in watching the chart.
- strong efficiency hypothesis, all information available is already perfectly priced in, market follows a random walk, no point in looking at chart pattern's again.
Thus, if all you can do is follow the price, close the chart.