What is best and safe for one trader is not going to be the same for all traders. You must take your time and and test trading styles and stategies for yourself to answer this question. It took me the best part of 3 years to answer this for myself.
I agree with you, the suitability of a strategy varies from trader to trader and the kind of knowledge they possess. I believe there is nothing like the safest or the most successful strategy . If a trader understands market movements and is equipped with knowledge about the trading tools and platform, he can successfully trade by making strategies according to the market condition.
The best strategy is the one you created yourself, you know it completely and understand all its nuances, it has been tested over years of trading and gives positive results.
For a safer Forex strategy, consider the "Conservative Trend Following" approach. Use moving averages to identify trends and enter trades in the direction of the trend. Implement strict risk management, setting stop-loss orders, and only risk 1-2% of your capital per trade. Consistent analysis and patience are key.
In order to trade more profitably and more safely, you also need to be able to select pairs for trading. It is no secret that different pairs have different volatility and different spread sizes, which directly affects the final trading results. For example, I like to trade the EURUSD pair, which has moderate volatility and low spreads at my broker fxopen (0.1-0.2), it is smoother and more understandable for me. Also, with such parameters of its movement, you can often set small stop losses.
It's impressive how dedicated you were to developing and refining your strategy over several years. The sources you mentioned—tradewithprecision, nononsenseforex, and proacttraders—offer valuable insights, and it's great that you found free resources to help you along the way. Consistency and learning from trusted experts are key to success.
Curious thing...even though I still trade Forex, it's not any of those Forex traders to whom I continue to give my ear nowadays, though it still comes down to three primary resources where I direct my attention, or more specifically: A. J. Monte, who primarily trades options; Peter Reznicek, who also primarily trades options; and Gareth Soloway, who primarily trades the major U.S. indices and equities, but trades commodities as well, and even the occasional option (if the impression I've formed is correct).
Best strategy in the long-term is investment in non-fiat assets like Gold or high quality stocks or government bonds, returns may cover inflation and provide some real returns, imo it is the best combination between safety and returns in the long-term