I think talking about it is still the right answer, but it may be a lack of tools that is a root cause of the lack of response. I like to assume that everyone involved wants to help, but they didn't because they didn't know how, or the difficulty of what you asked seemed too high. So let's see if we can get some tools to help.
My first thought is that if the problem is spotlight hogging, then working on improv skills with the spotlighted player sounds like a good idea, especially if they were sorry and do want to include you. To that end, I'd recommend: Improv For Gamers. That book has a bunch of improv skills, many of them designed to help people include other players and get good at passing the spotlight around (such as "Golden Goose", which has a video demo on the site). They also are a lot of fun just by themselves. (Also available here, as the Covid virus has put some constraints on the publisher).
Secondly, find out what your GM enjoys about interacting with PCs, and see if you can tempt them with that for your character. True, it may be different than what you want, but it can also be a fun challenge to figure out how to play your character in a way that is both interesting for the GM and true to your intention for your character. You'll probably find that your character suddenly has a lot more depth and realism than before, and my be more fun to play.
Similarly, your character can make it an in-game story point. Have your character notice that the other character is always getting all the attention, and make your character jealous. This is best if you let the other player (at least, preferably the whole group) know that you are going to do this, so they can react in-character in an interesting way. Then look for in-game ways to resolve the conflict. This can be selfish/evil resolution, like theft or bodily harm, or generous/good resolution like in-game communication, or trying to outshine the other character.
This is a good chance to play up character alignment if you want, or even challenge your character alignment, causing them to maybe change. Eventually one of the characters will be forced to either change behavior or learn something new about themselves or how the world works. That could happen after a major setback too, which would give a character a redemption moment. Not saying this is easy, but if you pull it off, the GM would probably notice your character more :).
Additionally, you could also ask the GM to make it an official plot point: the spotlight player's character is in-game favored by fate, some sort of chosen one, or something. Then your party characters can act in response to that in a way that makes sense. By the GM acknowledging it, it is at least now expected that the GM will spotlight that player. But your characters don't have to like it :). Or maybe they will, and pledge fealty, and make it their mission to serve. Depends on how you want to play it.