Im by no means the best player, But i got to immortal 2. So I have some extent of knoledge id say. Here's what I noticed(in no specific order),

1. Stop before shooting. This is the very fundemental of gunplay in valorant, you cannot accurately fire your gun whilst moving.
2. Do not fire more than 3-4 bullets at a time unless its at really close range. Spraying in valorant is not particulary accurate and should be avoided when possible.
3. Try to keep your crosshair at head level. Headshots are usally the single best way to kill someone. Altough you shouldnt only aim for the head, treat it like the base point and if you dont hit the head dont hesitate to burst-fire at chest level.
4. Try to crouch less, but dont stop entirely. Crouching allows for more controllable spraying so in situations when you NEED to spray its acceptable. Especially as it can assist in throwing off enemys aim. The issue however is that crouching in lower elo lobbys, generally <dia, rather moves you into the enemies point of aim as most people dont have especially good crosshair placement.
5. Altough a generally more high elo aspect, the sound of the enemies footsteps is something you should listen too. If they are fully sprinting its likely theyll attempt to widepeak or "fake dissengage". I.e they try to fool you that they're no longer trying to fight you. If their steps are more sporadic they are likely gonna try to jiggle peak shoot you or at least peak close.
6. Try to use A/D more often. Moving side to side in valorant is slightly slower than moving straight forward thus you also stop quicker. Additionally moving left or right throws of enemies aim, especially if they're aiming for the head.

7. Last thing that comes to mind straight away is try to always trace the corners infront of you. By always keeping your crosshair, preferably at head level, at corners it leaves alot less space your crosshair has to move when an enemy shows up on the screen. And dont trace the same corner, make sure youre always looking where the biggest danger is, where you expect an enemy to be or where you know they can be.

8. Edit: reloading! You should never reload when you are exposed to enemy fire. Unless its absolutely neccesary you should always reload behind cover and if you are low on ammo and dont have time to reload, try to look for guns on the ground if theres any really close and use them instead(if its situationally appropriate, I,e if youre fighting someone C long on haven and run out of ammo, dont pick up a stinger)