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I don't think any coin will now give 100x returns, first of all people won't wait that much and they'll book there profit at max 10x (if any coin give that return too). I have researched on some of the projects and found 4-5 good 5-7x return profit projects. My criteria for selection is what there team is, how efficiently they're working on the project. Are they keeping there community happy with the progress they're making and in which vertical there idea falls. My personal favorite and underdog projects are these:
1. POLY - Targeting security tokens industry, first to do so. Could be ETH of security tokens and even bigger. Potential 10-12x coin in next 6 months
2. PRIV - A must coin, targeting privacy and anonymity vertical, will be huge in next 3-4 months. Atleast 3-5x profits in next 6 months for sure.
3. ONT (Not a underdog but still in very early phases of it's launch)