In my defence, BTC at the top - ATH, and there is obviously going to be huge barrier here. Do you see a 100% move in BTC here, should it move above $20,000? If yes, it's good. If not (which I think will happen), you have literally exited BTC at the top which is $19700 or whatever and moved your money to coins like ripple or cardano or tron which still have 2x upside left if not more.
I see where you're coming from, but you have to recognize how little historical date we have.
In 2013, BTC blasted through the 2011 ATH like a hot knife through butter. There was barely any resistance. In 2017, BTC struggled with the 2013 ATH, correcting harshly back below it in January and March.
So before you assume jumping into alts is a good plan, you might want to make sure BTC is actually at a major top first. Even then, there is no guarantee altcoin season will kick off at that point just like March 2017. It's possible, but too early to say. I hate jumping the gun with altcoins.