Depending on the role you are playing:
**top/mid/adc **
- You can always ALWAYS improve on last hitting minions to CS better.
- Keep your lane pressured to reduce the chances your opponent has to roam.
- Ward as much as you can.
- Keep track of the opponents resources. (Summoner spells timing, warded locations, etc)
Team fights
Top :
In the current meta, the responsibility of initiating/tanking/peeling often falls on the top laner. If you find yourself the top laner, your goal in a team fight would be to either protect your carries, or go for their carries.If you have to pick one of the 2 (APC, ADC), You have to determine who has the more value to either protect or kill.
Mid :
As a mid laner, you would probably be very burst-damage heavy. Your goal would be to both kill their carry and stay alive. Take Ahri as an example, land a charm, follow up with dgf, a Q and a W. Chase with ult if they are not dead yet, and ult back out when you pick up the kill. The above scenario would be the ideal one if you manage to kill their carry and back out, taking out the enemy damaging source while staying alive.
ADC:
As the attack-damage-carry on your team, your goal is to basically obliterate their whole team while staying alive. It's a rather hard goal given that every one on their team would be targeting you. Stay out of CCs, stay in the back line, stay behind your tanks, stay where your support/jungler/top/mid basically EVERYONE can peel/save you, and attack whoever is closest to you.
jungling:
- You can work on the timings of the camps/buffs and make your jungling more efficient
- Secure objectives(Dragon, baron, towers) by keeping good wards around map
- Counter jungling by timing or warding the enemy jungle and steal/contest the buffs
- Counter gank by predicting where and when he will gank next and gank his ganks :D
Support
- Constant warding
- Keep track of where and when the enemy has ward.
- Keep visions on dragon and baron
- Peel your carries
- Be prepared to sacrifice yourself for your carry to get fed.
By doing the above in the respective lanes, I think you should be able to out-perform all silvers and march into the doors of Gold by no time :)
Add me in game if you want. FHMarshy