That is example that looking for new apps part I mentioned. I know there are FOSS Android video and proto editors. I just never needed any of them, so I don’t know which one is better or worse, but I know there are a few I have heard about in recent years. I know I have seen several contacts and dialler apps on F-Droid. Time to check them out one by one and hopefully one will fit the needs with minimal concessions. Others in this post have already mentioned some apps. See if they might work for you, too. I wish you best of luck looking for the right apps for you.
As a researcher, I am very happy that recently all the conferences and journals we usually publish to champion open access publishing. Due to this, all my work is currently FOSS and all the papers open access. That is a great change to the papers of the past where you have to have an affiliation to a university to get access to a paper and sometimes even that is not enough.