I'd look into buying once the decline is done, naturally, but for the time being you can look into shorting BTC pairs at market, perhaps diversifying your BTC risk by purchasing Ethereum with it (risk 1-3 average daily ranges in it, or BTS for instance). If buying BTC for the long term you can always reduce exposure on rallies and buy back more on dips as well. A balanced crypto portfolio with a few alts, monitoring % advance and decline of each component against usd or cny would be a good idea. You can rebalance the weights of each asset following systematic rules, and never fully sell your positions. Tim West has posts covering this if you browse through his publications, check it out.
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