Greetings! A short list of 5 champions to play right now. One for each role. These champions do not really have an elo limit, so you can win with them in low elo and high elo alike. Here is the list:
Garen for top lane, one of the most iconic top laners. This champion is very newbie-friendly. He doesn’t have a lot of very hard mechanics, so You can focus on other important things, like wave management, vision control, survival against ganks. You can take ignite as your summoner spell to play very aggressive and get kills. Or you can chose a little bit more defensive option -teleport. Don’t fall too far behind by returning to lane quickly in the early game and look for opportunities to make plays later in the game.
Kha’Zix is the best jungler you can pick up at the moment. He might have a somewhat slower early game before he can evolve his Q, but after that, everything just dies. Creeps, champions, objectives. He has a bit higher learning curve than most champions recommended in this list, but it is not very steep and it is well worth it.
Diana as mid laner. She is everything you want from a mid laner. She can push the wave fast and initiate fights in the jungle incredibly well with her gap closing ability - E and ultimate. She is easy to play and can wreak havoc against less coordinated teams. She can be played with ignite or teleport. She can be used incredibly well later in game as a split pusher, as she destroys towers extremely fast thanks to Nashor’s Tooth and her passive.
The best ADC you can go with right now is Ashe. She is not hard to pick up and very powerful. You can kite, engage or disengage a ton of fights. Her damage is quite high and the only weakness she has - no escape abilities. But even that, can be overcome by using your E (Hawkshot) ability and revealing incoming dangers ahead of time! Your jungler with solo laners will also love you whenever you reveal the enemy jungler in his jungle.
As far as it goes for supports - You cannot go wrong with Lulu right now. She is contested quite often, as she offers everything your ADC needs in this meta. A lot of shields, attack speed and movement speed buffs and protection against pretty much everyone in the game. You can play her defensively with Guardian keystone or more aggressively with Summon Aery. You can also adopt secondary runes to your liking. She is very versatile and adaptable right now. If you have a hyper carry in your team, you can rush Ardent Censer to push that carry even more forward in the game. If not - no problem! You can buy Redemption first, which will allow you to heal up your team before an objective. Fixing one of few flaws Lulu has - no sustain.