I think that this is a good trading strategy , with some risk , but less risky than other pairs , as we know that ETH will rise once ETH 2.0 launches soon. I've put all my thoughts here:
https://youtu.be/VOWFFf3-oxcActually you can't buy Bitcoin cheaper than $13 except the price goes down, so.. i guess
I can't see the video because slow internet here, you will exchanges your bitcoin to Ethereum and wait until Ethereum 2.0 launched and of course, will make Ethereum price goes up and exchanges again to bitcoin. But Ethereum 2.0 not give any guarantee the price will go up
And most of us doesn't want to click on any video though, better be safe.
As far as getting cheap bitcoin, then go p2p, as I don't think that ETH/BTC ratio will make any difference at all. Still based on the trading pair so it doesn't makes sense or at least this strategy will work. We still have to see what will be effect o ETH 2.0, it's all been hype in the last couple of months and it has been postponed many times. ETH was enjoying above $400 for a long time, but it seems the price has now resisted it and investors are shifting to BTC.