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So if this is a harsh pullback, it will be worth investing in eth? I can't really now because it's too expensive

There is a pattern to investment psychology, just like there are waves in the sea and waves in the sand and waves in the snow. By learning to read charts you can know when to get in. Right now this is an exponential run-up but after it peaks out, it will lose about 50% and then grind sideways for awhile. That's a good entry point. There's lots of such info on U-Tube, etc.