Not starting

No parts place in the area can get the injectors in. Out of stock everywhere they are all telling me.
I did, however, find some on amazon. But they are 6 weeks shipping. I'm going to try some salvage yards tomorrow first.
But I have a question, when the injectors have an internal leak like that, is it cause by debris so it's not closing all the way, and if this is the case could have them professionally cleaned fix the issue? Or is it because they are likely internally worn and there's no fixing them?
I did clean them myself a couple months ago, but in hindsight I should have back flushed them, I flushed them in the normal flow direction. They did, however, have a nice spray pattern.

Update:

So, today I thought about it, it hadn't occurred to me before, but I had changed the oil about 2 months ago and hadn't really driven the car much since, more out there trying to diagnose the no start and trying to start a lot. Oil level was perfect when I changed the oil.
When I just checked my oil level it was way over full and smelled like gas. So, 100% confirmed, leaking fuel injectors.
I'm looking at a set, it's just going to take 6 weeks to get them. I may be able to get another set faster, I'm waiting to hear back from those before I order the others.
But I'll have time to do another oil change I guess at least.

Okay, so here's where I'm at now:

I got the new injectors and installed them. The car will start with a spray or start fluid and keep running great. Unlike before, where it bucked and backfired. It doesn't do that now; it runs smoothly after it starts. It runs, it revs it sounds good. If I shut it off, it will fire right up again on its own, even if I leave it off for a few minutes, if fires right up on its own.
But it needs the spray to start when it's cold.
Today I did start the car without spray, but it was 6 degrees Celsius our, it cranked way longer than it should have, but it did eventually start. But if it's below 0 it will definitely not start without spray.
So, I believe it enriches the air fuel for a cold start. And it seems like that's not happening. If I add fuel via spray it starts. But it's not adding extra fuel on its own. Where do I look for this? I did try a new coolant temperature sensor with no luck.
Should I maybe check the fuel pump for voltage while it's cranking cold?
It doesn't need the spray on a warm start, so that makes me believe the fuel pressure is fine, it's only an issue on a cold start. I'm not sure where to go from here.
Actually, I'm going to get it running and use a propane torch to check for vacuum leaks next. But after that I don't know what else to look at.

It is new fuel, and I also put in gasoline antifreeze to evaporate any water that may have been in there.