Hey there @shubhra09
Here's my point of view on this, I really don't think that a Remix Competition is the perfect frame for learning & improving. It's more something you feel ready or not to jump in and first of all it's a good opportunity to challenge yourself. That's might be the only the benefit linked to improvement, it's never a waste of time though.
Now let's face it, providing feedback on each individual entry & remix is simply not possible just because of the amount of time that this will required and most of the time it's a paying service on it's own that you can get from many production studios & some labels, because it takes time when done right.
Each remix competition has got it's own page here on the forums, it's a dedicated place for you guys to exchange about other's tracks and to give feedback on improvement. Of course, it's not really happening because it's a competition with a potential release to win, so people are not very keen to provide feedback to others in this case, which is something understandable, but again it would be nice to see this more often.
Outside the Remix Competition frame, there's also a "Track Feedback" dedicated topic here on the forums ( of course you can't post link to Remix Competition there, it's forbidden to upload your remix to any medias ) but for other original work & tracks, that's a place where you can ask feedback.
S.A team as also started a weekly Live Stream on their YouTube channel, and you are welcome to send them links to original track and if the track is picked up by S.A, they will provide you feedback during the Live Stream.
More on this here : https://forums.sonicacademy.com/t/live-stream-announcement/34958
For any Remix Competition, here on S.A or anywhere else, it's a bit like sending a track to a label, in many cases just don't expect to get feedback or even a reply, unfortunately that's the real world when it comes to submitting tracks, better getting used to it IMO.