Profit/Loss, 3:1 ration is sustainable. Since loss is inevitable in forex, it is realistic. My suggestion would be to learn proper analysis for bigger trades. Some traders might trade not more than three times in a week, but grab more pips than those who trade multiple times each day.
At a minimum, I will only enter a trade where I think I can get a 4:1 ratio. Occasionally, you may be able to pick trades that give you a 10:1, but these setups come less frequently. However, when they do come, you can pile the volume on as they can be very rewarding.
How many actual reversals per day, vs how many actual pullbacks before another leg of the existing trend? If you want to trade reversals, you'd better get a lot of stats on where when & how they appear ...
Ditto that. Going against the grid only serves to make life difficult. If you are day trading, conserving mental energy is one small, but an integral component, for optimal performance.