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Do you want to increase height of you custom Thank you page?
You can achieve that by opening you Thank You page wizard and clicking on Edit Text option.
Then click on Source code icon and inside of source code add code height:500px; inside of <div> tab as shown on image.
After that Thank You page of you form will look like this.
Here is my form: https://form.jotform.com/60264877147968
Feel free to clone it.
If you want to achieve something else please provide us more details about what you are trying to achieve and we will be happy to assist you.
Let us know if you need further assistance.