So you're answering your question, then? It sounds like you're quite confident that backtesting is important for a trader's success already. I believe nothing can guarantee your success as a trader unless you can see the future.
As far as I know, backtesting is usually used to train or manage trading bots. If you're doing daily trading wouldn't the trading result show whether your strategy works or not? How would you backtest your daily trading strategies? On which app? It would be nice to know if you have a dedicated tool for that.
By trading daily and consistently backtesting, you'll start to see your mistakes and identify the principles you're not fully following in your own strategy. Backtesting lets you put your strategies to the test—it’s like a shortcut or an accelerator. If you're truly dedicated and passionate about trading, I believe you should leverage this tool to regularly refine your strategy (not to change it, but to add certain insights). This will give you experience in no time since you'll have access to historical data from years before you even started trading.You can backtest on several trading platforms, but I personally use TradingView. To access this feature, you’ll need to subscribe to one of their paid plans. You can also use platforms like FXReplay.