Picking the bottom! Dollar cost average?

BITFINEX:ETHUSD   Ethereum / U.S. Dollar
Purple line drawn on weekly chart. Dotted line less conviction.

Quick support lines and fib retracement levels. Support just under 500 and 460 and 400.... candles bearish . But RSI 30 and historically the bulls rallied on ETH when it went under 30. In addition some hints of descending wedge (didn't draw in as not the best trend lines ) .

For a noob like me I can find nothing to trade yet but for the investment part of my portfolio I may increase my holdings around each of the support levels.

Please criticise as appropriate. (especially if I'm using the fib wrong) Thanks guys.
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