Any further advice to help me get my running/cardio mojo back up to speed would be greatly appreciated.
Definitely focus on drinking lots of water and also eating healthy, but also focus on making progress with your cardio. For instance, try running for 10 minutes straight on a treadmill, then add a minute every day or so. So it would end up looking something like this:
Day One - 10 min run on treadmill
Day Two - 10 min run on treadmill
Day Three - 11 min run on treadmill
Day Four - 12 min run on treadmill
etc, etc. I did this kind of method with my friend and he progressed really quickly, just always aim for progress! A good way to think about it would be to try and be a little bit better than the day before, no matter how small of a change it is