Swap BTC to ETH

After today's inpennation of BTC price I would like to rebalance my portfolio by swapping some BTC for ETH, I still believe a lot in the potential of ETH, and for me this slow climb is a bullish signal and I would not want to miss it.

Any advice where to swap my BTC to ETH.

In the past I have often used sideshift.ai or simpleswap.io but the fees are a bit high, does anyone have any efficient solutions?