Owner financing alter terms during current agreement

[Toby Ima]

Hi all. I hope everyone is safe and in good health. I have a current owner finance mortgage on a house, and I am thinking of presenting the seller with new terms that would be beneficial to both of us. Everything was properly transferred and recorded when the initial deal was done months ago. Is it possible to alter our current arrangement or terms? If so, how would one do this? I am in Texas. Thanks in advance.