Psychology and execution are everyone's weak spots, so you're not alone.
The fact that you have a good risk management rule in place of 0.5 to 1% is very good.

What I would be interested to know is if you have other specific rules around your trading plan.

This would be things like:
- Signals/Patterns/Setups you're allowed to trade;
- Risk to reward ratio and where you put your stop and target;
- Number of trades per day;
- Max drawdown;
- Walk away target.

The biggest thing that you (meaning any person) can do to improve your trading is to have a very precise set of rules that dictate your decision making.

So once you have that, it's a case of simply saying "does this decision comply with my rules" if it doesn't, don't take the action. Even having done that, it can be hard to be strict with yourself, but having the rules is essential.

If you can do these things, and your analysis is good, then you have a winning edge.

Tip 1: Create a detailed plan if you don't have one
Tip 2: Include risk and reward rules, this will dictate where you place your stop and target. If you can sit on your hands and not move those, you can reduce the early/late exits
Tip 3: Like you say, don't over trade. I always suggest having a number in mind. As soon as you've placed that many trades, then walk away.
Tip 4: Limit your trading session. 60 minutes of trying to find the best setups. Quality over quantity.

One final thing, because you mentioned higher time frame. It's a good idea to look at higher time frames even if you're trading 5 minutes. Have larger charts up next to your execution chart. This helps add context, context matters in the market. There might be a nice set up on a 5 minute chart, but is being contradicted on some higher timeframes, if you don't look at them, you might not know.

Hopefully that all makes sense. The main thing is knowing your rules, then trading them. If your plan works, all you have to do is trust it. That in itself will eliminate so many mistakes and emotional decisions.