A marketing automation software that brings leads, not just existing sources?

Hi,

I would like to ask you if you have tried and / or if you have been successful at obtaining leads (mainly B2B) with marketing automation software and if so which would be a good choice and of course , cheap enough?

My little research:
SEMrush

– Zamanto auto poster (found on YT: youtu[.]be / b5ECARR5288)
– Marketo (good only for feeding, not for the generation)
– Hootsuite (again, nurturer)

It seems to me that most platforms (except the 1st) only allow you to feed your prospects, without generating them. Or are there others?

Thank you!