going light(er)? help

hi y'all, so i've already DIY bleached my hair twice (two sessions two weeks apart, my natural hair is a veryyy dark brown/black). just did the second session today and am planning to chop off the darker parts. should i go in for another bleaching session to lighten those slightly yellow parts? or should i just use a toner? i have wella t18 but idk how effective that'll be because im not 100% sure what level im at, its kind of a mix.

The very last slide is what my hair looked like after one round of bleach! all other slides before that (1-4) are after two rounds.