If only 1 of 6 got any distribution, I would separate account health from content performance first. Check each video analytics for "eligible for For You" or any tiny notice, then compare the one that got pushed with the five that did not: length, hook, reused footage, watermark, caption wording, sound, and whether it was posted right after edits or deletes.
I would avoid deleting/reuploading a bunch while testing. Post one clean, low-risk video that is clearly original, no borderline claims, no recycled watermark, simple caption, and let it sit for 24 to 48 hours. If that also gets basically no FYP or non-follower reach, it may be an account-level throttle even if the status page looks fine.
Also look at retention on the videos that did get impressions. Sometimes it feels like TikTok is not pushing, but the first test audience is swiping in the first second, so distribution stops fast.