It will be really hard to sell that many at all quickly except in, as others said, a bulk auction here where you would probably get low per domain returns (hard to say without knowing domains). If going the bulk selling route I would maybe divide into even smaller lots and divide by niche. Like a set just made up brandables, a set with ai or whatever niche related, etc. Ideally at least one headliner quality domain in each set to attract attention and list in auction title.
Good luck.
Bob