How did you decide to run your first marathon?

I’m trying to decide whether to run the NYC marathon this year. I started running 2 years ago and doing races last year. I really got into it and ended up just going for the 9+1. But I’m not sure whether to actually go for it. I’m in my late twenties, and have pushed my weekly mileage to a max of 25 consistently which has felt pretty good. But I’m unsure of how to determine whether I feel ready to take on the training and actual running of a full! I’ve run three halfs, none with much training, and I’m trying to determine the trade off between how much to train, and whether it’s worth it for me. What’s the minimum I could get away with? For every 5 mpw I add to my volume, what do I stand to gain? I’m a slow runner so depending on training could be looking at a 5-ish hour finish. To be clear, I REALLY want to do this, but I’m intimidated and I don’t want to crash and burn, so I’m wondering if I should wait another year or two before taking it on. So I’m curious—how did you decide when you were ready? How did you decide how much to train? Do you have any regrets about not waiting or starting sooner?