I want to increase my iPad's storage to 64 gb

No. If you need more space, you will need to get a new iPad.

No you can't sorry

The amount of storage on your Ipad is set.,

With iOS devices, the internal storage is fixed and cannot be expanded.

If you need more internal storage space, you would need to purchase another iPad with more internal storage space.

FYi,

A 32 GBs iOS device ONLY has an actual, usable internal storage space amount of approx. 21 to 22 GBs.

If you can,

If you need to free up free data storage space on an iPad/iDevice, you need to start by backing up your iPad to either Apple's iCloud or by connecting your iDevice to a computer running the latest iTunes and/or some other offsite, “cloud” data storage/backup services, like Google Drive/Photos, DropBox, BOX, Amazon Cloud Drive, Flickr ( for photos/images ), etc.

Then, delete any installed apps that you no longer use or use infrequently enough that they aren't missed (you can always reinstalled any purchased or free apps at some time later, as you need them).

Then, thin out/delete any music/videos/movies/TV shows/screen recordings/images/eBooks/

eMagazine/iBooks/audio books/Documents/PDFs, etc.

If you use a POP email account on your iPad, delete/thin out any old saved emails that maybe saved to your iPad.

To permanently delete photos/images off of your iDevice go into the Photos app and find the Recently Deleted folder/album and permanently delete any photos/images stored in that folder/album.

Also, you can check to see what stuff is eating up all your valuable data storage space by going into the Settings App,,General Settings Panel, in the right hand column, tap Storage & iCloud usage panel ( in iOS 11, it’s iPad Storage ), in the top Storage Panel, tap the Manage Storage panel, wait for a list of apps to generate that will tell you how much space each app is taking up on your iDevice.

Then, do a hard reset of your iPad by holding down both the Home and sleep/wake buttons simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.

iDevices need to maintain, at the very least, a minimum of between 2-3 GBs of free data storage space, AT ALL TIMES, to insure normal/nominal functionalities/operation and general overall performance of any iDevice.

Good Luck to You!

The latest iPhone launch was done a few days ago. Apple launched the iPhone SE, a 2020 model, available in selected areas. Go to www.apple.com/iphone to check.