My apple pen won’t connect with the ipad and I’ve tried turning the ipad off already what should I do

First, compatibility. Verify that your Apple Pencil is compatible with your iPad:

Apple Pencil compatibility - Apple Support

Assuming that you have an Apple Pencil that is compatible with your iPad, this support page may be helpful with pairing and use of the Pencil with your iPad:

Connect Apple Pencil with your iPad - Apple Support

If you continue to experience difficulties, here is one of the better troubleshooting guides:

https://appletoolbox.com/apple-pencil-not-working-heres-our-troubleshooting-guide/

Be aware that if your Pencil has been set-aside for an extended period, unused and uncharged, the Pencil battery may have been damaged through deep discharge. In common with all Li-ion batteries, they must always have some level of charge.

The tiny internal Li-ion battery is susceptible to permanent/irreversible damage through being left discharged for long periods. Even some “new” pencils can exhibit signs of failure out-of-the-box if they are “old stock”. 

It is essential that if you have an Apple Pencil that you charge it regularly - whether used or not - so as to protect the battery from deep-discharge. Do not allow a pencil to remain in low-charge state for any period of time - as the internal battery will fail, rendering the Pencil useless. Setting aside an unused Pencil, for extended periods, is a recipe for premature death of the Pencil battery.

If the Pencil Battery has failed, the only remedy is to replace the Pencil. If the battery has failed and your pencil is within its one-year warranty, you should look to having it replaced by your retailer or at an Apple Store.

Gentle warming of the Pencil (such as placing on a hot water radiator), prior to attempting charging of the Pencil, can resurrect a dead Pencil battery.

Hi there KokichiPantaPancake,

If you're having trouble parting your Apple Pencil with your iPad, we would recommend first making sure the pencil is charged. If so, the following steps will help us further isolate and troubleshoot the issue to a resolution:

1. Make sure your iPad has at least an 80% charge: Charge the iPad battery - Apple Support
2. Make sure your Apple Pencil is charged: Charge your Apple Pencil and check the battery - Apple Support
3. Make sure Bluetooth is enabled on your iPad: Use Bluetooth and Wi-Fi in Control Center - Apple Support
4. If the iPad is in a case, please remove it and try to pair again.

Should you still not be able to get the pencil to pair, please don't hesitate to respond back with the following information:

• The iPad model you're using and the exact iPadOS version installed under Settings > General > About
• Whether you've ever been able to use this pencil with this iPad

Best!