I've stopped my day trading, got kicked in the sensitive parts being on the wrong side of trades with some hard hits coming from SPX, TSLA and AMZN.
Long, short, you name it, lost any and every which way. Of course there's winners too, but they were too small, the old picking up pennies in front of a steam roller strikes! Also just bleeding theta if you're long options...say an expensive SPX put that just burns off with expedience.
Anyway, I'm holding a long SPY straddle and the call side is outpacing it's own theta decay (not the put's ... yet?) and other than that it's just contemplating cryptos. I "got lucky" with ethereum, but also "really missed out"... sold a chunk at around $40 from $20-30 I have another chunk that was bought down in the $13s... and chunk I mean under 10... It was trading ~$300 I last saw.
I'm setting up an old raspberry pi (2011 model!) to run influx and mongo to do some timeseries logging (also IoT timeseries... but that's another post). I should be able to easily get orderbook & OHLCV data from poloniex and log it, I'll try and get some other exchanges hooked up too, maybe try and become a data dealer?! I'm actually wanting to revisit an old attempt at machine learning market data, except use DeepRL instead of a classifier using whatever ML algo. Then I could just do "black box" arb, perhaps between two exchanges even.
Anyway, this business beats the snot out of me, but I'm still fascinated by the whole thing and don't see myself giving up anytime soon.