Perhaps a rethinking of how the dB model is structured might help you find a solution.
What I mean is to be able to look at your database types and fields … how they relate to each other … and see if things make sense or if additional fields to connect them are needed … or if additional data-types are needed.
I have not looked at all the details of your build or the how-to article by Bubble. Nevertheless, rethinking you dB model always helps 
Another idea would be to research for learning material online on how Instagram clones (or other social media type apps) have been built with Bubble. I believe I have seen some stuff online… If you decide to do so … I suggest you pay special attention to how they structure their dB (assuming that they show their build working of course!).
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