2 factor authentication would solve this, meaning if Respawn requires all players to link a valid phone number to their account this would help reduce the amount of people smurfing and as an added bonus this would reduce the number of recurrent cheaters as well
COD Warzone implemented this and it worked very well the only reason it stopped working is that a lot of recurrent cheaters keep buying the game on battle net sales and when purchased COD (for whatever reason) doesn't require 2 factor authentication. Most cheaters have a lot of money (have you ever seen the prices of cheats on online games - crazy expensive).
Apex luckily is only free-to-play, thus 2 factor would be extremely effective in this game as there would be no way around it unlike in COD where players can buy the game to get around it.
No idea if devs actually read this forum but 2 factor is urgently needed in the game to reduce smurfing and cheaters both in one big sweep.
Respawn themselves even said; Chad Grenier (Game Director at Respawn):
Keeps new players, right, when we turn skill-based matchmaking off, we see new players come into the game and they turn away much sooner, because they’re getting matched with high-tier players and they’re getting stomped. So we have concrete evidence that skill-based matchmaking is good for the overall health of the game. That’s why we haven’t addressed it. It’s clearly good for the game. I know that we get backlash from certain key players who want to go pubstomp people, but for every person pubstomping, there’s many victims that have the opposite experience, where they’re getting smacked. We need skill-based matchmaking. I think every game out there has some version of skill-based matchmaking. Obviously, not every game handles it the same way. But we feel like it’s really healthy for our game.
Thus by having people pubstomp through smurfing they are actually killing this game by reducing the number of new players and existing players keep playing this game in the long run.