Trading is all about your comfort. If you are doing great with intra day, you can continue with that. For weely trading I think you can do some demo trading with your strategy. M15 strategy and D1 strategy are not same. You have to be compatible with it. After then you can switch.
For trader should not trade on any time frame below H1. In 30m, 15m, and 5m charts there is so much noise. People start to over trade due to small time frame. A trader always should focus on developing good habit.
You are right, you definitely have to find a trading method and timeframe that suits your personality, your goals and your lifestyle. It can take a while for trading to really become comfortable, though.
Calculation of possible risks and a properly constructed trading plan will relieve you of the discomfort associated with uncertainty. If you cannot control the market, then you need to control yourself.