When I was trading in the past, what made me successful was to take short positions in the top 5 coins.
But I also got wrecked in the same way.
When I played, I always bought into large coins that were in a downtrend, but I also got wrecked from the same method (ETH).
The most successful approach was when I shared signals with friends and they profited, then generously sent me tips.
There was no wreckage in this method.
But over time, the tips became fewer because they eventually faced losses.