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Is it a complete waste of time to try without being a big fish (I've only got about 10K to venture on this)?

Yes. The intraday movement of stocks is small enough that you'd need to be using a large fraction of your capital on every single trade in order to overcome trading costs; and based on the Kelly criterion you'd need to have unrealistically high odds of betting correctly in order to avoid going broke.

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Do you think that interday would be more suitable then?

More suitable, sure. But I still doubt you'd get anywhere -- people who run hedge funds are very much aware of ML techniques, so I'd expect them to run circles around you.

A strategy: run a LOT of simulations, keep running them every day. When they are too good to ignore, go raise some capital.

There's a saying in the industry: your strategy will go south as soon as you put real money on it -- you can't raise capital without a track record of real money success.

people run MC all the time, not really a new strategy -- expect no breakthrough on that...

I'm suggesting that you run all of your trades with play money, and see how it goes. I'm not talking about Monte Carlo simulations.

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