I've played League since Season 4 after making the switch from Dota. I've spent a lot of time learning the MOBA genre while I was in Silver. And I spent 1000+ games in Silver before I made it out into Gold and then a further 100 or so games before Platinum. I'm currently in pursuit of Diamond but that's for another post.
You don't have to follow these tips but I strongly advise you to at least try them out and think a little bit as to where I'm even suggesting them in the first place.
Tip 1
Find champions that are overpowered or can snowball easily.
Play or find and learn someone who fits this description. I recommend Sion Top or Support and Annie in Mid/Support/Top. Sion's tanky and his bonus HP passive allows him to scale really well into mid/late game. Furthermore, he has insane amounts of crowd control which is helpful in skirmishes and teamfights. Then we have Annie. She has great csing with her Q and a point and click stun coupled with insane amounts of damage. She's great in skirmishes and teamfights as well, capable in bursting enemy carries and pumping out consistent damage. You play those two and I guarantee free LP. The point is for you to not only rely on what's going around as OP but to draw your own conclusion as to what will work for you.
Tip 2
Make smarter decisions to minimize deaths.
If you know you've pushed up for a while now, consider the fact that you might be getting ganked. Take a moment and maybe consider reducing the aggression and letting the wave push towards you. Otherwise ward up and be prepared for a potential 2v1 scenario.
Tip 3
Know when to trade kills and when to bail.
This overlaps the tip 2 but I think this deserves a section by itself. Take for example a 2v2 at botlane. Your ADC dies and you're in a position to get away but the thought of seeing a sub 20% ADC or Support tempts you to continue the fight. You try your luck and you die. So instead of a 1 for 0 trade, you increased the gold advantage even more by giving the enemy a 2 for 0 trade. And even if you secure the kill, bear in the mind who you're giving the gold to. The Support might not be as punishing as the ADC in lane but it depends on the matchup. Remember that if you're in a position where you're dead no matter what, you should always try and kill the lowest HP enemy. Otherwise just bail.
Even if you don't see immediate results, these tips will train you into becoming a better player.