Momentum strategy on ETH/BTC; Thoughts?

Hey guys, I recently thought of a simple momentum strategy on ETH and BTC.

The strategy is as simple as:

• is ETH/BTC above sma30?
  • yes: BUY and HOLD ETH (sell BTC and buy ETH if ETH/BTC was previously under the sma30)
  • no: BUY and HOLD BTC (sell ETH and buy BTC if ETH/BTC was previously above the sma30)

The goal of this strategy is to "optimize" the returns, by holding the most performing crypto between ETH and BTC and continuously switch between them.

For example: if ETH is rising faster than BTC, then you hold ETH to capture more returns. The same goes for BTC, if it's performing better than ETH then sell eth and hold btc.

The goal is to capture as much positive upside as possible when there's a rally, and to limit ETH losses by switching to btc when everything's falling down.

I tested the excess returns of this strategy and they seem quite positive:

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https://preview.redd.it/p8uqcuwo3nmb1.png?1000&format=png&auto=webp&s=dfb35dba393fef8c605d7be4a7e0a8ef8f5c4d74

https://preview.redd.it/v82qvzwo3nmb1.png?1000&format=png&auto=webp&s=2aff70b852b01b19bd24258ff170acd8a5f08c7b

Also, you can apply the same strategy to whatever crypto you like. For example, you could apply the same concept to DOGE/BTC on smaller time frames, so when DOGE experiences sudden pumps, you are exposed to the upside, but when it falls, your portfolio switches back to BTC.

This should mean that by using this strategy you can beat, at least by a bit, both ETH and BTC, am i right? Is everything in my thought process correct?

Where are the flaws of this strategy? Let me know what you guys think, and also, if some python developer would like to backtest this, feel free to let me know how the results could be/if it is convenient to actually apply this strategy. I'm very tempted to implement it with a trading algorithm.