There’s an interesting set of free agents available right now, including three former first overall picks: Cam Newton, Jameis Winston, and Jadeveon Clowney. It’s still possible that the Seattle Seahawks will sign Clowney but as of now, it doesn’t seem likely that any team in the NFC West will add any of these players outside of that potential transaction.
According to OvertheCap.com, right now this is the 2020 cap space of those teams:
Seattle Seahawks, $11,329,997
Any team could move some money around if necessary, but there aren’t many big free agent moves these clubs could make and if a big move does happen between now and the start of the season, predicting those transactions now is a bit of a useless art.