More solids and less formula

Long story short, my baby has always had issues with formula with reflux making milk stressful to just always struggling with the milk bottle. The past month has been distracting him with toys and even tv (whatever it takes to make him drink) and he would get abt 20 to 24 oz a day, along with three meals. These past few weeks, milk has been a STRUGGLE and even distractions aren’t working. He has dropped his milk intake to 15 oz a day. He is still eating his meals well. I have talked to his dr and she isn’t really concerned since he is 17 lbs at 9.5 months, told me to change formulas as I please etc. but I’m really worried because all I hear is “good before one is just for fun.” Is anyone else dealing with their littles not interested in milk and taking mostly solids throughout the day? Any advice? Is this a BIG deal or is this normal for some babies in taking more solids over formula?...