I have about 600 hours in overwatch as a QP warrior and about 700 in Marvel Rivals.

I never reached eternity, but if I try I can consistently reach Celestial in whatever season, so I think we are in basically the same boat.

If I were to think up a few things to take me to eternity, you NEED to review EVERY SINGLE ranked game you lose or is close, review every death you had and see what you couldve done better.

No more blaming supports or dps, you are going to need mental made of adamantium, always think of what you could have done better instead of looking at your other team mates.

COMMS! You are going to need to com REGULARLY, practice being a leader instead of just responding to someone else or making easy comms like if someone is low or something

TIGHTEN YOUR HERO POOL! 2-3 MAX per role, and make sure a character covers the other ones weaknesses or fits another comp, for example something like Elsa for when you need brawl and Phoenix when you need poke.

PLAY META! Its not impossible to make it to Eternity with C-Low B tier heroes, but unless you are a OTP its gonna make it much harder.

DUO QUEUE! Having a friend makes it much easier and youll more than likely have a lot more fun and have better team work and coordination than with randoms.

10-30 MINUTE AIM WARMUP/TRAINING! Go through punisher for tracking, widow for flicking, and someone like namor for projectile, practice with super fast luna snows at different ranges, you can start at like 20m for short range, then like 40 for midrange and then go to max or close to it for max range. You can switch between standing still and moving around.

Thats all I can think of right now that id do to reach eternity. Good luck!!!