See also Dr Krashen's comprehensible (not comprehensive) input theory. Lots of YouTube channels that offer graded videos in this style (to various degrees of adhering to the theory, i.e. some are simply grammar lessons which is not CI). The most well known is probably Dreaming Spanish.

I've had really great success with my children using national TV networks iOS apps with a VPN, e.g. SVT Barn (Swedish), WDR/ZDF/ARD (German), etc