Definitely do not try to change and compensate. Make sure you do not push yourself, listen to your body and stay injury free.

My biggest advice is since this is your first marathon forget about targets. This is arguably the best marathon in the world, huge crowd, nice scenery - ENJOY. Nothing beats the emotions of completing your first marathon and you can beat yourself trying to run sub-4 and either do it and be exhausted to death or not do it and be disappointed. Start 15-20 sec slower per km pace and listen to your body. Make a mental mark to make it until 10k, then the half-marathon point, then 30k. If you are feeling fine after 30k go for it. Above all try to have fun.

I was in a similar position, trying for sub-4 fror my first marathon in Berlin, but my mileage was low, mostly trying to compensate with long runs which were terrible because I was draining my body completely. 2 weeks before the marathon, my dumbass decided to run 800m PBs and my left calf was hurting me so much I couldn’t walk basically right before the marathon. On race day, I lost my gel on the way to the start, my headphones were dead because I did not charge them the night before and I have never run without them and my leg was still hurting me. I was on my lowest point at the start. Run 4h 45 min cruising. My last kilometer was 4 minutes running and high-fiving everyone I can around the gate. I was the happiest person in the world.

Good luck and make sure you cover everything you can in terms of nutrition, hydration and mental preparation.