Ok explain me - for example I have a strategy where I have an Enter Long at the previous low and Close at the end of the bar on GBPUSD

How can I inverse my strategy to have enter Short at previous low and close at the end of the bar ??

Enter long at previous high (this means it enters short on previous low) for the opening point, and bar closing as the closing point.

How can I inverse my strategy to have enter Short at previous low and close at the end of the bar ??

Usually when you build a strategy and it goes down to zero very swiftly it is a bad strategy

It should be because of the trading rules but also is greatly possible the sharp loss to come from charged spread. To check this one can remove the spread and swap fees.
Anyway, it's easy to invert trading rules manually.

I m new top this forum

as far as I am testing FSB the Optimizer for stop loss and take profit zould be a great idea .

But I think what is still lacking - but @mail me if I m wrong would be an inverse strategy tester . Usually when you build a strategy and it goes down to zero very swiftly it is a bad strategy but as Charlie Munger the partner of Warren Buffet always say "invert always invert" it is often a good way to find treasure gold strategy or idea.

Thanks for your work

- we are not sure to see MT5 finalized at end of this year: still many things not done nor implemented: only the FX part is partially coded
- still buggy
- not so many brokers propose it at time (i mean the ones we can trust of course)

- Connect FST to MetaTrader 5;
- Connect FST to PathFinder API of FastBrokers;
- Make FST trading multiple strategies in one instance;
- Add Martingale MM and Break Even to FSB;
- Write tutorials and documentations;