I'm seeing a drop in installs and are trying to understand whether it's due to seasonality, algorithm changes, increased competition, store listing performance, changes in featuring, or something else.
Well mate... you have to check a lot of the stuff then haha I can't help you with that kind of description
-you can check algorithm changes in app tweak
-Seasonality and conversion evolution per country and store listing in Play Console
-Competition by simply checking your keyword rankings and analyzing your niche (you need an ASO tool for that)
-featurings with an ASO tool