Is it time for me to swap my ETH to BTC?

Hi,

I started buying ETH and mining ZEC in 2015 until 2016 and got in a lot of coins. I stopped mining and buying anymore cryptos in 2017 and just held on with what I had. A year ago I swaped all cryptos beside ETH to BTC. Currently, my wallet is still composed of a majority of ETH.

I noticed ETH has been gaining value vs BTC and now is starting to go down a little bit. I am just wondering if I should swap them all for BTC? I think Bitcoins is the safest currency to keep for the long term while Ethereum has been fluctuating too much in my opinion.

Thanks