I do not wish to disappoint you but there are NO “Experts” who have proven that any strategy they may create or design, no algo, no formula, no indicator, no get rich quick scheme that is infallible.
You are not dealing with a mathematical equation that can work perfectly all the time.
WHY NOT? Because the stock market is comprised of 12 Different Market Participant Groups. Each market participant group has a different reason, or agenda for buying or selling a stock, different capital to invest or trade, different speed of execution, different order types, different styles of trading to which they apply various custom strategies based on which of the 6 MARKET CONDITIONS is present at that time. Trends vary from stock to stock and ETF.
You probably think of the market as basic: Wall Street vs Main Street. This is the Charles Dow Theory, the inventor of the Dow 30 index and first expert to use stock charts. This was created in the 1890s bull market. So a theory or strategy for that 130 years ago stock market probably worked most of the time.
This is the Stock Market of Today
I can assure you that there are literally hundreds of different strategies being used by all these groups.
Every professional, and I am speaking of REAL professionals not the retail gurus, constantly adjust their trading strategies to fit the current Market Conditions and Trend based on: WHO IS IN CONTROL OF PRICE. When professionals know the answer to that question, then they choose a strategy that fits that trading condition. Thus professionals make those high incomes.