If you want to be a pro, remember: You are playing the long game, it doesn't matter if your winrate is 30% now if your K/D is trash, with the time you will get better, and eventually grind into being a pro, believe in yourself. the present doesn't matter, what you build for the future does. think big.
For now prioritize DMS over ranked, you gain nothing playing ranked in low elo, its a slower version of DM with no comms and terrible util usage, first get the basic, a good aim (don't forget to have good comms and util usage)
After you have a "decent aim" you should be around diamond -ascendant , then u dont have to focus so much on your aim. focus on your comms and util usage, what i used to do is record my matches, and after the match watch it and i HAD to ask my self everytime to everything i do "Why i am doing this? there's nothing better i could have done? How could i have noticed?" you dont need an insane aim to climb into immortal, i got immortal and my aim was on avarage the worst of the server, but i was flex and confident on my calls and skill usage, and made me get a high winrate, help your team.
Agent wise, you are thinking it wrong, if you want to be a pro you are playing the long game, it wont be in 3-6 months prob not even in 1-2 years to get you there. stop thinking "i should play this agent because he is meta" you should be open to play most of the agents of your role, if you are flex play with EVERYTHING, Sentinel, play with ALL sentinels, and so on. Don't get to attached to a single agent and become a single trick pony (like Yay) the meta changes, Yoru "was" the worst agent in the game, now he is one of the bests, if a agent is bad now in a year or less it can be the meta, be ready, and also you have to have a good notion on which agent is better in each map, and adjust to the comp of your team (don't instapick)
Dont bother with win% if you are going pro, you will climb, no matter how long it takes, looking at it only affects your mental positively or negativily, but it doesn't really matter
This is not a step by step. just because your focus now should be DMS it dont mean you should not pay attention to comms and util usage, If you get do immortal don't deny aim training. (oh and aim lab and those things are trash long term, it's only useful in the beggining, when your aim is terrible to learn how to use your mouse, nothing is better than practicing your aim in the game itself, then in another game "pretending" to be Val)
Most important: Dont be toxic, be nice, don't stream snipe, if you build a good reputation around you, becoming a pro will be infinitely easier. make connections, if you make a friend in a high ranked game, this guy might invite you to a team for example. Becoming a pro is only the consequence of your hard work. If you truly want it: You can. Believe in yourself and don't matter what the others says.
Stats doens't matter, Duos don't matter. Only you matter and your determination. It's not easy and that's why so few make it.
Good luck
allat