AM I DOING SOMETHING WRONG? ADVICE/TIPS/IDEAS PLEASE (Can't win in Gold 5)

I'm a support main. Got (back) into Gold 5 this season and I'm about to be demoted. I was 0 LP, then -5 LP, then lost again and and am now at 0 LP again. Not sure how that worked out. I'm probably one loss away from demoting but only playing again will tell I assume.

Ever since I got (back) in G5, I have had to report 1-3 people every game for afk, inting, trolling, rage quitting, and/or being toxic.. I've only won 1 or 2 games in G5. And they still had very toxic players. Is it just me or are other people's ranked worse this season? Is it my MMR? I feel I've tried every approach with toxic people. Whatever the team needs, is good at the moment, and/or what I'm comfortable with I'll play: Janna, Nami, Lulu, Soraka, Taric, Zyra, Morgana. Nothing seems to change it. I don't play ranked much now because of it.

Should I try to dmg carry more like Brand/Zyra rather than try to support someone else/depend on them for dmg?

MORE INFO ABOUT ME AND TL:DR BELOW

I started LOL Season 6. Season 7 was my first time ranking, starting halfway through the season. Made it to my goal of Gold 5 at the very end and stopped after that. I'm most comfortable with enchanters/healers.

I regularly watch "The Strategy Professor" on Youtube: a High Plat/Low Diamond(jumps back & forth) Support Coach/Streamer. Started watching him shortly after I started ranking.

I truly feel like I've learned a lot from him. I shot call Objectives when I see fit, my Vision Score is way better, I call Summoners and Ults more, and I try to think more strategically on when/who to fight. I know I still need work on stuff like checking peoples' KDA/Items more often, CD's, etc.

Of course everyone believes they're right and are good at this game but I truly believe I belong at least past Silver.

TL:DR I'm running out of ideas on how to get past G5. And yes, I'm always working on myself, not just blaming others.