Yeah its hard to set take profit and stop loss isn't it? With leverages, its way way more difficult to have a proper R ratio! one mistake will be your last mistake
I think it's too safe. If you want to trade conservatively, then it is better to use a leverage of 1:30. If you need to trade with moderate risks, then you can use a leverage of 1:100
Depends on your strategy and capacity. For scalping 3-20 minutes waves 1:100 or 1:200 is good, but only if you are able to use a SL of about 2-3 pips and still have more and bigger winners than losers. If you still have no experience / capability to identify those kind of opportunities, you will have to use less leverage and bigger SL. 1:10 is reasonable if you are not an experienced scalper.
Also, the size of the leverage depends on the size of the deposit. That is, when the deposit is impressive, the trader will never trade without risk control, and even a small percentage of profit in monetary terms will be quite noticeable. Therefore, there is no point in overestimating the risks to achieve good profits. But when the deposit is small, then many set the maximum leverage in order to be able to quickly accelerate the deposit and earn more. At the same time, the risks are not consciously controlled, which often leads to the loss of such a deposit.