If you own Titanfall they have made the season pass free (basically the DLC).
Of course this is no help if you do not own the game. The game is currently selling on Origin for $20 (US). Is it worth it? I dunno. It is a neat game and looks fantastic and can be fun as hell but it gets boring semi-quickly and being multiplayer only (or mostly) it has suffered from low player counts.
But if you own it this is likely to at least give it a short injection of life. Might be worth re-downloading and playing again while the fun lasts.