Sounds like a balance of these exercises & a reasonable diet may benefit all of us.
A lot of this information will help, but I also see the deep dives into details that may sidetrack the original request of this topic.
Like SpeedRacer (& some others), it's good to find something you enjoy so you can stick to it. I may do some plyo because I want my lateral movement to be faster in basketball. Or I may go on some 5k or 10k runs to help my stamina in soccer.
Biking is a nice way since the scenary can change and you can ride with others near your pace so it's not as boring. We all have different ways of being motivated, some could be improvements or some can be for health.
I think reducing portions and eating more frequent are nice ways to start since you still get to eat what you want in a sense. Integrating more legumes and fruits also help. Some people are good at adapting to light-switch diets while others are better at progressive diets.
Just my 2 cents from an out-of-shape old guy