I can’t find my photos

A couple of things:

1. If all the photos were on your old phone, transfer those to your new phone. You should have made a backup of the device from which you could set up your new phone. However, if you were using iCloud photos to sync, and not all of the photos uploaded to the cloud, then you'll only be able to recover those items in the cloud without the original device.
2. Not sure why you mentioned "old" iCloud. You should only have one iCloud account (multiple accounts are not a good practice). If your photos are attached to two different iCloud accounts, you'll have a very long possible way of recovering by downloading all the photos in iCloud to your new device, turning off iCloud photos (Settings > Photos), logging out of iCloud then logging into the other iCloud account and reenabling iCloud photos.
3. You still haven't answered some of the other questions. I suspect that you did not have enough iCloud storage to sync the entire library on your old phone. Therefore, you'll only be able to download those items in iCloud without having your old phone.

Where do you see 30,000 photos? On your device? Has the device synced to iCloud? Do you have enough iCloud space to keep the 30,000 images?

Open photos

Tap library

Scroll to the bottom

See the item count and the iCloud status below that.

Ok. But, do you have space in iCloud?

Settings > Apple ID > iCloud

If you had say, 50GB of storage but have 100 GB of photos, photos will stop syncing.

Were you syncing your photos to iCloud from your device?

If so, do you have the device from which you were syncing?

Otherwise, if you're setting up a new device, do not have the old one, and only have what it is iCloud, then you only have 6,000 photos.

No. The only photos are those in iCloud.

• If you have your old device with all of your photos you can ensure that everything syncs to the cloud and then download to your new device.
• If you do not have your old phone, then you will only ever have access to the photos in iCloud; just the 6,000. That's it.

Any photos will be at iCloud.com/photos or on any iCloud connected device.