What month can we raise the rent again in CA

[Faye Sherman]

I just purchased a duplex in CA February 2019 and the rents were way under market. One individual had a lease that was good until September 2019 and the other had no lease in place. I gave the one with no lease a 60 day notice of rent increase, then gave the other a 60 day notice July 1st, effective date of increase for September 1st. NOW I have to lower the rents on January 1st 2020 because I raised them more than the allotted amount. My question is what month can I raise the rent again after the correction of January 1st, 2020? I know you cannot raise the rent more than twice in one year equal to the allowed amount. So the date in which I can raise the rent again ONCE for the whole amount would be, not twice? Thank you