Need some advice

Hi all! This is my 1983 atc70 which I scored for 100 bucks I changed it to CDI electrical and got a new carby for it and got it running and she ran fine idled started and was amazing through after riding it one day the next she wouldn't start so I used some start ya bastard and she fired but wouldn't idle and and just lost power and ran like a pig so I cleaned the carb and got a new spark plug through I had to numb start it bc I broke the pull cord and it made no difference she still runs like a bag of rats and has lost even more power. Can anyone please explain what's going on would be greatly appreciated like is it time for a rebuild