As stated above, by increasing the number of polling places the impact of any of these can be reduced enough to not matter. Using government ID cards or voting invitations sent by authorities before handing out the ballot helps as well, anything short of stealing the invitation wont work. And even if you steal the invitation the real person has to not show up. Because if they do, without invitation but with an ID, your fraudulent vote (singular, as in one vote) is immediately identified.

And I am describing just one way of how paper ballots work save, anonymous and at scale. You need some truly mind blowing organizational fuck up (look up the last election in Berlin) for it to not work. An even then it affected one single (?) voting district (as in polling places, not candidate districts if i remember correctly), was instantly identified and investigated and almost impossible to use to temper with the results (it was found out immediately).