Big edges are hard to find.
Better to have a small trading edge that can be executed frequently.
$100k account
Risk:Reward 1:1
Win rate: 55%
50 Trades per month
2% Risk per trade
27.5 Winners = $55000
22.5 Loser= -$45000
Net monthly gain = $10000 ie 10%.
Aiming for 2:1R 3:1R 5:R will not only take a long time to collect data, but also leads to risk of ditching strategy before law of large numbers can play out.
No matter where you are in the trade, there is around just as much chance of price moving 1R for you as against you.
So 'letting your winners run' is a flawed way of thinking. Find out where there is slight skew eg momentum, pullback. Then execute, execute, execute.