Is it permissible to return to watching anime after having intended to abandon it for the sake of Allah, especially after it became clear that it is not forbidden if it is free of prohibitions such as music and other things?

We have previously clarified the permissibility of watching animated films (cartoons) as long as they do not contain Sharia (definition) violations. Your statement is a resolve to abandon something for the sake of Allah, and it is neither an oath (yamin (definition)) nor a covenant (ahd), as both require explicit verbalization. Your intention was to abandon what you believed to be forbidden for the sake of Allah, and the permissible anime was not included in your resolve. Therefore, there is no sin upon you in watching anime in the permissible manner.