Make a bot take over a disconnected player’s character. Give them the same selected character/gear, but control them with a bot.
If the player reconnects to the game, give them a 30-second wait timer to re-take control, so they aren’t just pulled into the middle of a huge combat. If the character is currently dead, allow the re-connecting player to instantly take back control of their character.
Nothing is worse than crybabies, ragequitters, and lore challenge farmers quitting because things aren’t going their way, screwing over the entire team. At the very least, having bots will mean you have a meatshield distraction to draw enemies attention while you do the real work.