The only thing I know with half of those features that's discontinued is the old Darkroom app but that doesn't tackle some of the bigger compatibilities. Source: about 2 years ago

Not sure if this is applicable, but if you're using Word or Scrivener or something, you may want to switch to a plaintext editor like Dark Room or Typora--something that won't underline your spelling and grammar mistakes. It doesn't even have italics or bold to get in your way. Dark Room is a little old, but I found it here: https://codex.jjafuller.com/books/dark-room/page/overview. Source: over 2 years ago

I use DarkRoom. Full screen, no distractions, no "fancy" auto-formatting. Source: about 3 years ago

You don't necessarily have to reinvent the wheel. If your business already has defined buyer personas, it will often make sense to reuse the same information to define your Instagram target audience. You can also use instagram search without account to find users who will be interested in your content. Source: over 1 year ago

You can search for competitors by keywords in the Instagram search, by hashtags or by using search engines or THE BEST way - is to use Instagram Search tool for this. Source: about 2 years ago

Or https://inflact.com/tools/instagram-search/ (try with and without wildcard). Source: about 2 years ago