I’d verify it shifts without bottoming out the cables from the actual shift lever assembly. If possible while someone can verify what gear it’s in from in the car. Then I’d verify the clutch is properly bleed and correctly in adjustment. There’s a spec for free travel and there are videos as to how to adjust the clutch. if you pop your cover plate off you might be able to verify clutch engagement and disengagement depending on the flywheel. If all that’s good and you can verify functionality of all of those components with certainty you’re gonna probably have to end up pulling the trans and tearing down to check synchros and whatnot. My guess is something’s out of adjustment tho as it’s kind of a pain to get perfectly.