First am not a pro trader, but my trading techniques have proven fundamentals. I recycled around Bitcoin and some handful of good altcoins; I trade with a hand full of funds since altcoins and the bitcoin market move in the opposite direction; I fill my bags with altcoins when the alt markets are down against Bitcoin and sell them when the market is on the rise to buy bitcoin which will be on a downtrend at that moment.
This technique has worked for me over the years.
I don't think this strategy still work in the market now, the market sentiment has since changed, it's like majority of Altcoins price movement is in tally with the movement of price of bitcoin though lagged a bit behind, the movement of price of bitcoin is like an engine pulling all other altcoins, thus I usually monitor the price of bitcoin first before taking a decisive action of trading any altcoin/ USDT pair, basically my trading strategy was built around this technique of price movement and Price Action in sharp contrast with altcoins price movement in opposite direction.