musescore

Probably many ways, check https://musescore.org/en/handbook/3/formatting
longer paper, smaller page borders, less staff or system distance, staff space setting... and some more

The relevant parameters can be found here:
https://musescore.org/en/handbook/3/layout-and-formatting#style-page
where you can adjust staff/system distances.
and here:
https://musescore.org/en/handbook/3/page-settings#scaling
where you can adjust the size of the entire score to fit the paper size.
and here:
https://musescore.org/en/handbook/3/layout-and-formatting#layout-stretch
where you can stretch or squash selected measures.
and here:
https://musescore.org/en/handbook/3/page-settings#page-size
where you can make the height/width of the paper bigger.

These are generalities. Posting your score will allow someone to suggest a best way for your particular piece.