Anyone else still have a fussy baby?

Anyone else still have a fussy baby? My baby will be 9 months old on October 7th. She is still very fussy during the day, does not nap well and still not sleeping through the night. I’m a SAHM and going insane! I feel like I have to be doing something wrong for her to still be acting like this! I don’t have any help with her bc family lives far away. Just looking for some advice, oh and just to note, it’s hot where I live, so getting outside is hard. Most days end with me being pissed off or crying bc I can’t handle it anymore. I really didn’t think at this age, I will still be feeling this way!