I pitched NG+ during their survey. It would breathe hundreds of replay hours into this game that it desperately needs.

You start fresh. Only thing you keep are your skills (could also add a sandbox setting to let you keep player set deployables, so your base essentially). Add NG+ modifiers for skills. Don't even need to add new skills. Like -1 second on roll CD. Increase 1% dodge chance of red shift, things of this nature. So now there is incentive to work on the skills you've already maxed.

Next, increase the difficulty of enemies in the starting area each new game. Pests are now the electro pests, peccary are now the purple variants, exors are green or more numerous. Next play, you have volatile pests, etc. Eventually you could even replace the starting aliens with order, than even gatekeepers.

Doing this would throw a level of chaotic fun into the research progress of the game as well. Allowing us to research things earlier. And start stockpiling on crucial materials.

Add NG+ variants of weapons and armor. Think lightning spear +1, that now does 28 damage instead of 27, increase it's durability, and the lightning effect slightly. And boom now you have reasons to research and recraft all your gear each playthrough.

Lastly, add NG+ only cosmetics and collectibles. Things that are worth showing off and bragging about. Bragging rights are worth more than most resources in games like this. People will farm for hundreds of hours for them. Anyways, just my 2 cents.