buy high and sell low

no but seriously, the most effective strategy is buy and forget
and be ready for huge dips, have enough cash available to buy the dips even
and to get through those market conditions and trust your research
and your gut feeling that you have made right investment
and wait for it to go up
which is why i don't do intraday, just buy with delivery and hold
It's easy to say and hard to do... that's the theory.

So don't trade, just invest is much better and don't bother thinking about a lot of strategies like trading, if investing just buy and forget... keep doing it the same way with DCA accumulation.
Now don't focus on trading, but accumulating is better.