The simplest thing you can do is to just use your phone as little as you can.
I use a regular phone because my model doesn't support GrapheneOS or other custom OSs. So I just use my phone as little as possible: calls, whatsapp/LINE/telegram almost only for info about meeting people, not to discuss deep stuff. Proprietary backup deactivated. No games, no superfluous stuff if not a hardened Firefox as browser and my Bank app (sigh). All other few apps I have are FOSS and/or privacy oriented. I use syncthing with encryption enabled so I can backup all data on my desktop with little hassle and regularly delete photos/chats on my phone.
If I have to use a privacy invading app on my phone to buy a parking ticket or something similar: I download the app, block all permissions, use it, delete cache/datas and then delete it.
If I lose my phone tomorrow it would not even be a big deal because I have almost no data in it. I know it's not a perfect model since a few apps and the phone itself do have telemetry, but it's better than going around with a device filled with sensitive data. It reduces a lot of stress and it's very manageable for me.
Freely pirate everything without guilt. If you use torrent then seed how much you can. It will help your fellow human beings.
BUT if/when you have money to spare invest them into creators/art that bring you something. It seems antithetical because they taught us real art should be free from capitalism's shackles yadda yadda, but art and artists needs money to flourish. Find indie artists and wacky projects and fund them.
If I remember correctly you can use ReVanced to login into your Youtube account and have an experience similar to Newpipe. You'd probably have better recommendations (the bot comments depends on the channel though). I've never looked into it, but it seems a popular choice.
Are you able to watch every video normally with invidious and newpipe on Desktop (Linux/Windows) ?
In my experience, yes. For desktop usage you can use invidious from browser and freetube [https://freetubeapp.io/] as external client/software (but I've never used Freetube so I can't comment on that). Newpipe is android only and I HIGHLY recommend it if you have Android.
The problem with invidious instances is that sometimes they get pretty laggy because of server overloads (I guess? honestly idk). You also don't have your account tailored recommendation, but in my experience you can jump around a lot, especially if your main interest are programming videos.
Another method I use is downloading the videos I'm interested into using JDownloader 2, but that's pretty extreme and I relied on this to combat my "algorithm addiction". Got fed up by it months ago, so I put my favourite channels on a RSS feeds and downloaded only the videos I was truly interested into. Usually downloading videos require way less bandwidth than streaming.
No, simply because I've never commented on youtube, so it'd be pretty useless, if not counterproductive. Giving even more information about my political/tech ethics to Alphabet doesn't seem smart nor useful in my position. Also, I don't even watch youtube videos on their website now. I usually use invidious instances or newpipe.
But I'm not against people doing it, especially if the ultimate goal is spreading awareness and building a community of people with privacy oriented ideas.
The simplest thing you can do is to just use your phone as little as you can.
I use a regular phone because my model doesn't support GrapheneOS or other custom OSs. So I just use my phone as little as possible: calls, whatsapp/LINE/telegram almost only for info about meeting people, not to discuss deep stuff. Proprietary backup deactivated. No games, no superfluous stuff if not a hardened Firefox as browser and my Bank app (sigh). All other few apps I have are FOSS and/or privacy oriented. I use syncthing with encryption enabled so I can backup all data on my desktop with little hassle and regularly delete photos/chats on my phone.
If I have to use a privacy invading app on my phone to buy a parking ticket or something similar: I download the app, block all permissions, use it, delete cache/datas and then delete it.
If I lose my phone tomorrow it would not even be a big deal because I have almost no data in it. I know it's not a perfect model since a few apps and the phone itself do have telemetry, but it's better than going around with a device filled with sensitive data. It reduces a lot of stress and it's very manageable for me.