1 year old sleep schedule

I have a 14 month old and we’re expecting another in a few months. My 14 month old will only sleep 8/9/10 hours at night. She refuses to go to bed until 10-11-12 at night and wakes up around 8-9-10 am. She takes ONE nap during the day for about 2 hours. For months and months I have tried everything. Literally everything to fix her schedule. I am trying so hard before the new baby comes because I am just exhausted all the time. I don’t know what else to do. Does anyone have ANY advice ANYTHING that helped their babies sleep longer/earlier at night? I just feel defeated.