Hope you are doing well and sorry for the trouble. As described, you want the text to be aligned with the top of the text box, so that you have enough space for two lines of text.
The option to align the text with the top of the text box is not yet available. However, you may try the following text field properties and see if that helps you with the overall goal. (If you have the permissions to edit the Form)
Open the PDF Form > Go to Tools > Prepare form > Double Click on the Form field to open the 'Form field properties menu' > Under 'Options' select 'Multi-line' and 'Scroll long text' > Click OK and check.