I will adopt all the strategies that will give me profit in future. I have to follow up on the fact that it is best to hold on to the long term rather than the short term of trading.
Of course, following what gives you profit is the right shot, after all, we are not trading to lose our money, and thankfully, both options could do that perfectly well, it's all about what you know about them and trading. Also, I respect your opinion of long-term trading being your preference, still, it's all about the trader in question, both are fine. Some will never go for long-term trading as they see it as a waste of time. Yet, they get to make their money with their short-term preference.
It's a trial and error process, to be honest.
You have to find certain indicators that will fit your trading style, and that will cost you x amount of funds in order to apply the indicators you want to find the right ones for you. Now, for me, using only one won't work, I'm using at least 3 indicators, you have to make sure your price chart is readable for you to be able to see in which price or point you're going to enter your trade.
Trading in its entirety is not what anyone could just dabble into, it's tricky and risky, and the more you think you know, the more you would realize you still need to learn and control. This calls for patience in training about it, and it might start from using one strategy in its simplest form, and with time, others could be added to be sure if it suits the trading style and plan of the person or not.
There isn't many. There is always 2-3 at Max. Mostly because of different market situation. You have different strategy for a trending market, a different strategy for a consolidating market and a very different strategy for a sideways market. You first recognise wait for the trigger then recognise whether this trigger is useful for this type of market or not and then you eventually go into that particular trade.
I guess you are not getting the gist at all, there is no maximum for the strategies you can combine, only that you might want to limit them reasonably to avoid confusion. Those that you mentioned are just what the market could do, they are not strategies. And to buttress this, a trader could have three strategies combined together for only trend detection. What about that? Not to talk about considering other conditions of the market to find more strategies to detect them.