How to find my style?

I know there are a lot of adult returning players on this board. Hopefully someone has a relevant experience to share. Sorry in advance for a long winded post.

I am getting back into the game as a middle aged adult, having not played regularly since high school. Way back then, I played mostly doubles for competitive matches. When I played singles, I would play a heavy serve and volley, chip and charge style of game. Some of this was growing up in era with so many professional serve and volleyers to watch on TV, and some of it was hiding my weaknesses (poor stamina and footspeed) while playing to my strengths (good hands at net, good kick serve to chase to the net).

I'm about 8 months into high frequency play, typically 4-5 days per week on court in some way or another. My ball striking is improving, and I've played about 20 singles matches in a local flex league. My fitness and stamina have improved a ton. Now, here's where my dilemma comes in...

I'm feeling unsure of my path as far as developing a preferred strategy. I work with a coach that I like and trust. I play at a high 3.5 level right now. We have established a goal of working my play level up to a solid 4.5, and he is coaching me with that end in mind. He wants me to work more angles with my groundstrokes and come to net aggressively when possible, including playing serve and volley as much as possible. His logic is that if I'm already mentally comfortable with that, it's an especially effective strategy against the current breed of players that don't see it much.

The problem I'm having is that there are a LOT of days when my volleys and overheads feel like trash and end up losing me points that I should win easily. I have played multiple matches against guys with similar UTRs to me on these days, and have reverted to "just hit quality groundstrokes, deep in the center of the court" and cruised to easy wins that way. Looking back, I'm not sure how I feel about winning that way. Am I exploring a different style that might be more effective for me, or am I taking the easy way out and hurting my progress?

I have encountered a variety of opinions on this. My coach tells me that I need to commit to imposing my game, and not worry about the match results right now. I feel like this is consistent with the advice I read in The Truth About Tennis when he talks about trying to move your game from 3.5 to 4.0: the tactics that win at 3.5 do not win at 4.0. Hitting a hard ball right at someone often produces an error at 3.5 but does nothing for you at 4.0, where you have to build a point more intentionally and open the court.

On the other hand, maybe I just haven't found my right style? Maybe the 17 year old me couldn't win against good players by grinding out groundstroke rallies, but the 45 year old me is made for it? I am more physically fit now than I was then, despite the advancing years.

Has anyone gone through something similar, and how did you reconcile it? Was it based on getting feedback from playing partners and coaches? Was it based on what made you feel good inside when you won matches one way vs another? Was it based on what got you more winning results?