Need help - where to get data like Ubersuggest?

Hey guys, we're building our own Ubersuggest and having issues with historical data such as traffic source (medium/source) on Semrush and SimilarWeb (direct, referral, organic search, display, paid search, social, email, etc.).

Where would you guys recommend we get access to that information at a cheap (if not free) level?

SimilarWeb/SemRush APIs are crazy expensive, we use now DataForSEO for keyword suggestions, ranking, volume and such but we are lacking more on the historical data, traffic, source, etc.

Thanks team!