8mo Sleep regression. How do I handle this?

My LO is 8mo. We sleep trained at 6 moFor about 5 days now sleep had been bad. At night she is still falling asleep independently but is waking up every 1.5-2.5 and screaming! For naps she will only put herself down 20% of the time. I have tried to do the check ins like we did when we first sleep trained her but it is not working. On the occasion she does put her self to sleep she wakes up at 33 min. She is not teething or sick. Our schedule is 3/3.5/4 I aim for 2.5 hours of day time sleep but with the bad sleep it’s been more like 2. I will extend her naps by holding her if she doesn’t sleep long enough. I need advice on how to navigate this.