I forgot my pin number

https://www.askmefast.com/How_to_master_reset_a_Linsay_tablet-qna4870487.html

Method 1 Unlocking Android 4.4 and Older Tablets

1. Enter an incorrect PIN or pattern 5 times. ...
2. Tap the Forgot PIN/pattern/password button. ...
3. Enter your Google address and password. ...
4. Tap Sign In.
5. Open Gmail on another computer or device. ...
6. Open the message received from Google. ...
7. Click the link in the email.

https://www.wikihow.com/Unlock-an-Android-Tablet

Depends if it is an apple or android tablet, and if it has a removable memory.
if it is a Samsung, remove the memory card, then factory reset the device. Yes you will lose some of your data but you will be able to access what us on the memory card.
Sort of the same story for an iPad
https://support.apple.com/en-us/HT211078#:~:text=If%20you%20can't%20remember,settings%20after%20restoring%20your%20iPad.

U tried hard reset it by holding the power button and volume when tablet off then going down to factory reset by using down button and press power button ok go down to yes and that will hard reset but make sure u back Ur tablet up before u perform an hard reset

which tablet you will need hard reset it but u will loose everything on tablet if u not backed it up

which tablet u will nedd to hard reset it u will loose everything on the tablet if u not backed up before you forgot password

by hard resting but which tablet have you got

hard reset by recovey options

Hard reset! google it for hard reset for specific model or manufacturerer related products.

depending on the make of tablet there are various methods of preforming a factory reset,search internet you should find method for your tablet, probably utube, and reset it back to the way it was when it came out of the box.,