Probably not. I've went in balls deep.

When BTC tanks I don't sell anything at all, and instead try to buy more at the bottom.

Way to go! Buying the dip during a bull market is a proven technique to boost your net worth. Only cowards sell dips, champions buy.

I've seen Coinbase go down a lot when volatility is high to prevent its users from winning.

Would suggest Binance but I guess you are from the US so that's not really an option.