If they're structured so that shareholders can do this directly (not a case of needing to be able to influence the board), they'd have to convince 11% of other shareholders to either not vote (if just a majority of yays/nays is needed) or vote with them.
Sweeney on the other hand has allowed Fortnite to become their top item and it generates money other developers only dream of so I highly doubt other shareholders are particularly angry with him (they probably love him quite frankly). He's sufficiently defensive/offensive when things are setup to work against Epic Games (when Microsoft was ambiguous as to how important Windows Store would be to the Windows 10 ecosystem. To the chagrin of vocal gamers, he's aggressively going after Steam which could've frankly crushed Epic Games Store at the onset if not for how aggressive Epic has been).
Honestly, their best course of action would be to cut bait.
Almost no companies have direct elections because CEOs rightfully hate them, shareholders get scared and can make uninformed decisions, and the board is better informed to decide on the behalf of shareholders. In the cases they do exist, stock is issued with different voting rights to prevent activist shareholders turning over a company without the board's approval. Also in this case, even if there was a direct election structure at Epic, there is no other 11% for Tencent to convince. Sweeney himself owns more than 50% of the stock.
Sweeney on the other hand has allowed Fortnite to become their top item and it generates money other developers only dream of so I highly doubt other shareholders are particularly angry with him (they probably love him quite frankly). He's sufficiently defensive/offensive when things are setup to work against Epic Games (when Microsoft was ambiguous as to how important Windows Store would be to the Windows 10 ecosystem. To the chagrin of vocal gamers, he's aggressively going after Steam which could've frankly crushed Epic Games Store at the onset if not for how aggressive Epic has been).
Honestly, their best course of action would be to cut bait.