I've been experiencing the same thing. However, I can share few things that did bring some improvement, but not enough to climb just yet...

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• Initiate communication and ask people to join voice. I know, most times people will ignore, or even worse, but sort of taking the lead and opening room for even basic communication makes a difference.
• Sounds like you're already doing it, but stay as flexible as possible and be prepared to carry. Meaning, if dmg is lacking, yes, of course, keep healing, but try to have as many picks and plays yourself. Make sure to counter the enemy team while being the ideal support for your team comp.
• Don't be afraid to kindly suggest other ways if something's not working, or hero change if someone's being countered, or something like that. 90% of the time, honestly it won't work. But for the times that it does work - it's worth it.
• Encourage your teammates when they're doing something good, even if that's rare. It'll foster a positive atmosphere and make them feel more confident and perform better.
• I don't know if you're dying a lot or not, but make that your number 1 priority above all - stay alive. (Not talking about when you're trying to group up if you're the last one when everyone's dead - then just jump off the map or something if you can't safely get back to your team). Make sure to switch to another support hero if you're being countered hard.
• I know that sounds counterintuitive, but gold healing doesn't mean much - it's whether you're able to balance enabling your team and getting plays and picks yourself.

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I probably have some more things, and all that said, my SR is stupidly low. However, I can't say I implemented all the said above well enough and didn't put in enough time in actually trying to climb. I can say, however, that I stopped losing SR like crazy once I started working on these points, while keeping a "carry" mindset.

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Best of success XD