If you're done collecting data, you can let the IRB know, but since you're done, the deviation won't be of much concern. Since you collected all the quantitative information, you can either write up what you did or pursue interviews by video conference (if you do video conferences, let IRB know).

Honestly, if you have some interviews (at least 6), I'd start analyzing. 6, even 4-5, are enough and well backed up by research.

This qualitative study has been selected and implemented in the framework of transformational models. Participatory action research (PAR) was used to collect data in this study. This method was chosen because it is an approach that encourages the active participation of victims to build their new identity. The basic philosophy of this method is that people with problems can provide effective solutions to their problems. Another reason for using the participatory action research method for this study is that it "evaluates real activities about learning in specific situations, not abstract matters" (Kemmis et al., 2007: 277). It also identifies and determines what the researcher is concerned about and helps the researcher to openly challenge the conditions of injustice (Loewenson et al., 2014). It also avoids one-sided research representations and expresses different perspectives

Interested