Adding Friends and trading dinos.
There chould be a system like in Pokémon Go where there chould be a new friends system where you chould friend ppl and at the cost of vip points or Dino bucks, you chould trade Dino Cards to other players and the price of the vip points and bucks scales with the card's rarity, the reason is so that hackers can't make fake accounts then trade lvl 40 Indos or Compys to their new accounts. There can also be a system where you can give gifts to your friends like an option of S-dna of your choice or Boss-dna to insensitiveise logins on the daily. This chould even make an economy out of the game's dinosaurs and make the community even bigger.
Other fun ideas
One cool idea chould be a doubles mode where you chould play in a doubles match where each player would take turns fighting both parties at a time and the max reserve count chould doubled but shared with you and your allies which chould allow fun team dynamics, combos, and strategic gameplay. Perhaps another idea is that there chould be a win streak counter that allows you to get rewards based on how many wins you got in casual or competitive but not in friends mode, that's just for fun and we don't want people to farm rewards. And the more wins you get there can be better rewards, for example in teir 1 you can get food and rare dinosaurs but in teir 7 you can get free legendary dinos and some cash or vip points so it would insensitiveise ppl to play to win and the meta chould develop faster to figure out the best strategy to achieve success.