Never too many to count.
What we can close are loopholes in laws. We could amend the constitution, repeal the second amendment...Rewrite it to make sense in the modern world, where the only militias are run by white supremacist domestic terrorists.
Allow people to have fire arms, but under a lot stricter controls. No magazines with more than 6 rounds. for anything. Anywhere. Ever.
Bump stocks and any other prohibited modifications will land you at least ten years in prison. Anyone caught in possesion of or manufacturing 3d printed weapons, same penalty. No civilian reloading, only businesses will be able to buy the equipment, the primers, or the powder to do so, same penalty for possessing it illegally.
NO more person to person sales, ever. You go through a licensed dealer, or you go to jail.
NO more constitutional carry. You prove a need, you take a class, and you can NEVER carry in a bar, at a public facility like a park or a school, anywhere that doesn't apply to your stated need on your permit...If you got it for work reasons, you better be doing work while carrying it.
All of this ^ is no more than the rest of the world does to keep things under control. It works for them. It will work for us.