The best way to get more links on Terrarium is by using a Real-Debrid.
A Real Debrid is a paid service that gives you premium access to a large number of popular file hosts on the internet. Your fee goes to maintaining and paying for those servers, so your download speeds are not limited and uploads are not capped to save space. This means you will get more 720p, 1080p and 4K Links!
You can see from the screenshot below, the difference with and without Real-Debrid: