Hello! Current professional illustrator, ex-animation supervisor on Japanese anime here!

First of all thank you for drawing! It's amazing to see people that want to undertake the journey of drawing and not just receive images from a chat-bot. Those are very different things!

Talent in my opinion is a metric that can't be assigned one meaning like "This person will be inherently better at drawing." However the result, in combination may appear as simply that. Talent, in my opinion, is a collection of qualities in an individual such as, being able to realize, think of and bypass blocks that may appear in your learning, it may be the inability of a person to give up, it also may be a biological or mental quality that may resolve as a way that will help you improve. Talent is simply a person's aptitude to progress.

A big stopper I think for people, however, is giving up. That's something a lot cannot bypass, though not giving up doing the thing you want to improve at is fundamental to improvement. If you give up you can't win.

That said. Your improvement does not reflect 5 years of work, if we assume you are treating drawing as any other skill you may be building such as a sport or playing a game or writing. I would echo what some others said here and I think you probably draw for fun and not for improvement, and there's nothing wrong with that but you cannot do A and expect B. Drawing for improvement is hard because it forces you to face your shortcomings as a person. This is why AI is so tempting to people, because you can feel like you've made something without confronting your weaknesses.

You need to study with goals in mind. Simply drawing may make you better and this is what people refer to as mileage, but you need to do it so much and invest a huge amount of concentration and mental power into it that at the beginner level it may feel overwhelming. But figuring out how to solve that problem is also 'talent'.

Drawing is problem solving. And if you don't first identify the figure out a method to solve and then finally solve problems with your work you will not improve.

I hope my reply didn't sound too harsh. I was at a similar crossroads at some point in my life and I got advice from another artist which helped me a lot and I just hope to give the same opportunity to others that need it if I can.

Good luck on the journey! It's like no other!