If you intend on keeping the present computer you may explore and alternative to MS Office.
https://www.libreoffice.org/
If MS Office is a requirement for your needs >>
Explore the Apple Trade-In Process where the Value of the exiting device could be used against the cost of a new Apple Computer, iPhone or iPad
Notation - Some devices and depending on the computers age may have little to no value at Trade In time.
But at least the device will not arrive to the Land Fill Site and be recycled in a responsible way by Apple
Or Shop Refurbished Apple computers at an Apple Reduced Cost