Sleep training methods

If you sleep trained, which method did you use with success?

My 8.5 month old was sleep trained, we did a form of the Ferber method when she was 4.5 months old going through the sleep regression and it worked 3 days in - but then around 6 months old she got a nasty cold and was teething so we were comforting her more at night, rocking and nursing to sleep, and now she’s stuck in that habit.

We switched up her bedtime routine so she has a bottle before bed as she would always fall asleep while I nursed her, but she will wake up 2-3 hours after going down and won’t settle unless she’s nursed to sleep. I don’t want to continue that habit. I’m fine feeding her in the middle of the night if she’s actually hungry but I’d like her to be able to self settle and put herself back to sleep when she wakes between sleep cycles.

Literally open to anything at this point as I haven’t had a solid nights sleep in over 2 months.