IF you had even invested later in the downfall you would have made Money as btc has crossed 10k again and it had fallen till 3200$ around . Those who believe in it would have definitely invested and hosted it and have become rich now .
For now, BTC is just trading at $7300 but its possible to rise to $10K again, actually what we just need is to believe and just wait for the right timing.
its easy to find a good opportunity to buy and sell if you have the patience and trust on bitcoin.
did btc ever reached 13k usd this year ? sorry but i forgot it . it maybe long enough , but what i only see is the price usually stays at 10k usd and below . timing like what you said is still a key to earn even on these low tides