Do not force it. This is an interference engine and internal damage can occur if the timing is off. That is what it sounds like is the issue.
I attached a pic below showing the timing mark alignment positions. Is that how it was placed before and after the timing belt was installed?
Let me know. Also, let me know if you tried cranking it with the starter or if you have only done it by hand,
See pic below.
Image (Click to make bigger)
Monday, September 4th, 2023 AT 9:54 PM