Trading only on one side or following one strategy will never make you a good trader. To become a skilled trader, the trader should start trading after knowing the trading related knowledge. Trading when there is a trend in the market increases the chances of profit. However, in any favorable or unfavorable conditions, when the trader can gain the courage to trade according to the market position, he will be able to make profit if he trades. If he decides to trade, he must take risks. Trading with the sole intention of making a profit increases the chances of losing. Every trader must be thoroughly researched before taking a new entry in trading.
Applying only one strategy to all conditions in trading I think is not too bad, in fact if the strategy is carried out consistently then the trading is likely to be successful but back to broad knowledge in trading to avoid unwanted things I think all traders must have that knowledge or learn it. In trading anything is possible to happen and the level of risk for that I think all traders understand and understand that traders must also try to minimize the risk, namely by expanding their trading knowledge.