In most cases, a single-cylinder misfire won't prevent the engine from starting. It won't run properly, by any means, but it should start.
You have already done a lot. Did you check to see if there is spark at the spark plug in cylinder 4? If not, check that.
Here is a link that explains how it's done:
Next, if at all possible, record it cranking and upload it for me to hear. It may help me identify a possible issue. Also, when you say it sounded bad, describe what you heard. For example, did you hear something like a knock, tick, backfire, and so on?
Let me know.
Monday, January 22nd, 2024 AT 8:39 PM