How do you practice the Korean pronunciation 'beolsi neujeosseunikka'?

I am learning Korean, but I am having difficulty pronouncing the sentence '벌씨 늦었으니까요'. I mainly use Pimsleur at the moment, and this app explains the meaning as 'Because it's already late' and shows the pronunciation as 'beol sseo neut eoss eu nikka yo'. However, I still struggle to pronounce it correctly. I have tried practicing with Papago and YouTube, but it is still difficult. I know that Pimsleur can be stricter than real situations, but I have to continue using this method for now. Is there a good way or tip to practice Korean pronunciation in Seoul or Itaewon? I am curious how other foreigners have solved this issue.