Trading bitcoin was never a problem for the skilled traders because it has the capability of giving profits at the down trend as well and also you can choose bitcoin for trading when you are just new to it which might be helpful to understand crypto trading and they you can start trading with different pairs.
What you told is correct that all time is good time if you are a good trader as even in bear market traders are making profit. As you have holding of bitcoins so in bear market you can sell on high and buy back in low, this way also you can minimize your buying price and increase your investment.
If you are new to trading then first better join bounty and earn some coins and trade with it and learn how to trade and then from that profit you can trade more and when you feel you are good to trade then you can invest and start trading.