Gas oven won't heat to temp - already installed new ignitor

Hello,
Originally, our oven would not lite/heat - the ignitor glowed, but we could smell gas, and the oven wouldn’t work. Following the most most common repair suggestions, I replaced the ignitor.
Now, the ignitor appears to be working fine; there is no gas odor, but oven still will not heat above 150F degrees.
Any suggestions or advice on my next step? I do not have an voltage tester either.
I thank you in advance.
TD