Currently the market caps of coins are as follows:
1 Bitcoin (segwit2x) proven, leader, first mover advantage
- Ethereum (smart contracts)
- Ripple (bank to bank settlement
- bitcoin cash (low fee, micropayment bitcoin)
- litecoin (faster, cheaper, tests features)
- NEM (combo of major features)
- Ethereum Classic (non altered ledger of ethereum)
- Dash (anonymity and speed)
- IOTA ( combo of features, fee-less transactions for micro payments)
- Monero (anonymity with strength)
From this list you can see that the market wants smart contracts, bank to bank statement and fast cheap transactions as the top 3 features. Then you get to NEM that is a combination of many features all in one coin. After that you have IOTA that makes transactions so cheap they are free, and finally strong anonymity.
From this I can tell you that bitcoin and bitcoin cash should both work to take all the features of the top 10 and put them into their coin. If you make a coin that has all of these features you could clear the board of the top 10 competitors.