In my field, arXiv (free preprint server) is actually much more discoverable than journals. It tends to be on top of Google searchers, many people (myself include) check it out daily, and few people even check journals (why would you check dozens of different ones if everyone posts their work on arXiv?).

> everyone posts their work on arXiv

Not everyone.

Do you know that you can get rejected by arXiv if they think your publication is not worthy of their publication.

It's an open access journal masquerading as pre-print server. There are other much more open pre-print server.