My main criteria for high probability 100x: Low market cap. Highly undervalued compared to similar coins. Good development team. Use case that's in demand. Decent branding, with an appealing ticker that stands out, is easy to remember, and inspires speculation (Example of good tickers: DASH, OMG, ARK, PAY, WINGS. Example of trash tickers that hurt their coins: MAID, SNT, SNM).

My picks:

GEO (current market cap 3.3 million)
ZEN (current market cap 16 million)

GEO is special because 100x will only bring it to the mid caps. No need for it to become a top coin to see 100x. ZEN needs to get to $1.6 billion, which is moonshot. 25x is maybe more realistic for ZEN, unless it sees real-world adoption...

In a bull market, with a rising tide, these coins could do 100x on speculation alone. If the projects are successful long term, higher is possible.

I'm not counting on these projects being big players in 5 years, although it's possible. The big players will more likely be coins that already have market caps over $100 million, or haven't been launched yet. The main reason GEO and ZEN are attractive, is that they're so damn cheap compared to similar coins.