Your first mistake was depending solely on IG in the first place. There are plenty of social platforms that our popular right now, that are bringing in alot of traffic. Most people just follow what they see the next person doing, and is why you mostly here about people only doing IG. But trust me, there are alot of us that are using IG, and an quite a few other social platforms... some popular, some not as popular.. but the key is they're not overly spammed like IG, and convert extremely well.
Goto the playstore, check out the different social platforms.. check out the statistics to see which ones have alot of downloads, and make yourself a simple automation program to advertise on it, or have someone develop one for you if you don't code yourself.
Continue with IG if you're using it, as it's still profitable.. but once you have it automated, then it's time to start thinking for yourself.. dont wait on someone else to tell you about a good platform that's performing well.. or wait until its already been spammed to death before you get to it. That's what will separate you from the people that cringe everytime IG updates and think that its over, because if for whatever reason it did become impossible to automate on it.. you'll already be one step ahead. And the good thing is, there isnt public automation software available for most of these platforms.. so your only competition will be a couple handful of other experienced marketers.. which is better than competing with a few forums worth of people.