That depends on the distribution of your holdings and wether you consider going all Fiat should BTC make big moves? If you hold a significant part of your crypto-portfolio in altcoins, I'd definitely consider reducing that a little. No need for 100% BTC though IMO.

Personally I'm ~85% BTC right now. I moved most of my crypto capital from alts back into BTC over the 2016 pump seasons (used to be almsot 100% alts, no idea how I survived 2014 and 2015 like that, lol). I think I emptied every single alt wallet - except for UNO, which is now effectively my only long term "hodl" besides BTC. With this setup I feel pretty safe and prepared for any major BTC moves.

I'm not planning to sell my BTC anytime soon, but having BTC liquid is great to play the high-cap alt markets, or to long/short BTC during big moves...