Managing bedtime 9mo old and 4year old

I am beyond frustrated and don't know what more to do other than give up. Husband and I work opposite schedules but I work from home so I still am able to help him when he needs it through the day.. I'm the afternoon/evening I am alone with no help. I know these are my kids and my responsibility but I'm struggling. I rush through my day working my ass off for my job then have 3.5 hours to clean up, make dinner, give baths, start laundry, get 6mo old in bed, walk my dog, get 4 year old to bed. I had a tight routine, it worked for a while. Now my 9mo old consistently wakes up 30 minutes after I lay her down every night. She has to be held for at least an hour, I'm sure she's entering the clingy stage which is completely fine however I have my 4 year old to take care of also. I feel like I am failing her, I have no time to play, read, go on walks or anything anymore. Now she is on her tablet or watching TV while I lay her sister down. I was never an electronics type of mom but I have nothing else to give her to do that I know she will be safe with and not create a ginormous mess while I'm in my room. None of these things are my girls' fault, I just don't know how to balance things so my baby gets the snuggles she clearly needs and my 4 year old isn't being left on her own for over an hour every day.

I'm sorry for the really long message, my husband can't help and I don't have family or friends either. If there's anyone like me I really could use some suggestions on what got you through this, I feel like I'm drowning.