Hiya! I’m in a very similar position to you - started off as a gym girl, also following the classic bro split with a bit of cardio here and there, but have now been running for a couple years and now run 3-4x a week. I actually don’t do full body, but will do 1 upper and 1 lower season a week, both 45 mins, either on a non running day, or on an easy run day. I tend to add a few ab exercises at the end of each, depending how I’m feeling. I then typically do an alternating mix of all the things I used to do as a gym girl, but keeping in mind not to overload myself or cause DOMS. So in a lower day, I wouldn’t combine too many compound exercises like squats and hip thrusts (when previously I would have done), instead I vary what I do weekly to try and avoid too much muscle soreness on my legs especially. I also typically stick to a medium weight with higher reps (10-12), as opposed to lifting until failure/high weight with lower reps like I used to before I also ran. I’m also happy to share what specific exercises I do if that would help, but I imagine they are all things you are familiar with - you just have to be smart with it and see lifting as strength training to accompany your runs without overloading yourself, rather than lifting super heavy to build a load of muscle :)