Hi there and welcome
A larger disk is a Bluray, all DVD'd are limited to 4.7GB You can get double layered but most players will not read this and most writers cannot right to it
What you can do though is use a program called DVD Shrink to do this, but of course you will lose some quality though this can be small.
It's a free program and you can download it from my link below
Then Start DVD Shrink and do the following steps.
Click "Open Files" and select the VIDEO_TS from Step 2.
Open "Edit -> Preferences..." and select your desired disc size.
Click "Backup" and select a new export file folder.
For a DVD-5 (4.7GB) export, Step 3 will only take about 10 to 15 minutes.
Start your DVD burning software, and burn the output when completed
As long as your close to 4.7GB now, then you will get the space reduced enough to fit on a DVD.
Let me know how you go please