Uninstall ig app al and use it on mobile browser. Even better is touse ig only on desktop browser (since desktop time < time spent on mobile).
Did this for IG as I hate the time sunk and repetitive lame stuff reels are. They get you lost for hours but are so forgettable. Watch reels on mute and they will appear really lame - you can start transition this way.
Regarding reducing mobile screen time - don't buy the high end smartphone with better display or refresh rates. Prioritise what 2-3 things you really need & buy a decent reliable one. For me it's calling, utilities and camera - so bought a Pixel 6a for 25k in bbd, which serves well for 2 years.
For other video consumption - move it to TV or laptop. If you have the money and want comfort as you grow older, why watch YT, or movies or shown on a small mobile screen. I screen cast YouTube from my laptop browser to TV during my dedicated leisure hours.