The lucky ones are staying? I've been through all this at a previous job. What about all that knowledge that was lost that was not shared or documented? I'll guess that at least 33% of those that remain now have a steep learning curve to get caught up to their new/additional roles.
Those that stay will now have to pick up the work of the employees that are gone. The show must go on. The same amount of work is still there whether there are 15 people on a team or 5. Expect to try to be 'coerced' into working a lot more extra hours. What about the teams with on-call duties? (I went from on-call 3-4 times a year to 12-15.)
Those that got 'lucky' will have survivor's guilt.
To save yourself from the next round, backstabbing and making your coworker look bad will become the norm.
There will be no more training the 'new guy' or sharing knowledge - hoarding knowledge will become standard.
Those that remain will have to listen to leadership' lies about how the layoffs are over (for now - we all know more are on the horizon), that you need to focus on your jobs and to get over it. (I have heard leadership tell me/us the latter part to 'get over it.' This is when you realize how sociopathic they truly are.)
Now that this is the new reality where your career can be snatched away at a whim be wary if you are asked to share your knowledge or train someone else on your team. That's a huge red flag.