My "sleepers" for 2019 are
- Stakenet $XSN (lots of development and new ideas, Tpos, Masternode as a service, DEX on masternodes)
- Navcoin $NAV, love the alias possibility and the regular updates without hype
- Expanse $EXP, one of the first ETH fork, with plenty of developers and ideas

For a super micro cap, keep an eye on $ARTO (only on tradeogre).