Here's a few tips for jungle that I got from a challenger player who gave me a lesson and have put into practice. Don't focus as much on ganking your lanes and getting your lanes fed. The first thing you need to do is find out what side of the jungle and what buff the enemy jungler is starting. With this information you can provide your lanes with so much support and even call out where the enemy jungler is or probably is therefore warning your lane. If your lane ignores your information guess what? You know yourself where the enemy jungler is so why aren't you there to carry your teammates bad choices? Or at the very least to clean up the kills after they kill your lane.
Step 1: Deep ward around the 1 minute mark or 1:10 mark. Get a few teammate to help you. Are you red side? Get a ward at the krugs if you can or at red. You'll get more intuitive as you practice and learn more junglers routes. Are you blue side? Place the ward over the wall by the blue buff so that it illuminates both camps (gromp and blue) so you know which camp they are starting.
Step 2: Make a play because of your vision. Did you know most junglers are very low by their third camp and can be picked by you quite easily if you have the intuition and ability in your champions kit? You have to know your matchups, focus on beating the enemy jungler. You can carry the game quite easily if the enemy jungler is shut down. Are they gromp? Well blue is their next buff then probably wolves and you know wolves is camp 3 and they are probably wolves. You may be able to pick them or blow their flash there but you need to be aware of the mid laner and bot lane. Are they pushed? If they are pushing they will maybe rotate to you and kill you so maybe not a good idea. Is your lane pushing? Well they're probably preoccupied with early game farming so go for the kill at wolves and gtfo.
Step 3: Call out where you believe the enemy jungler is around in the chat. Tell your team the knowledge you have gained and use pings to show their movement. Say "sej was just at red buff, she's probably going to gank bot now" then head to bot and get ready to counter the gank. Counter ganking is fucking OP and they probably will never see it coming at low elo.
Step 4: Know your timers. Not just yours but your enemies too. Second round buffs is time to make plays. Is your blue spawning while you are playing red side? Do you know he started on his red side (coming from blue side of the map)? Well if your blue is up and he started red then guess what, his red is up. Tell your team, he's at red come with me to his red so we can win the game. Or "Who wants a free kill at sej's red?? Come now!" Ping like crazy.
Knowing where to ward is important as well. Watch some videos to find out the best spots for optimal vision. You know when you smite wolves how the orb sits in the middle of the 4-way intersection? There's a reason, that spot is fucking incredible to ward and you gain so much information from having a 4-way fork in the enemy jungle warded. Also, the bush behind the enemies red is a great spot for a pink ward, It could potentially last there all game since most people path through there assuming its safe barely paying attention.
Jungling is hard and getting blamed isn't fun, but it most likely is your fault because jungling is very easy way to carry low elo games. You probably need to work on your sense of jungling and intuition as well as communication. Are you constantly monitoring your lanes as you clear your jungle? OR are you spaced out on your jungle camps? The people in lane are your babies to protect and tehy make mistakes but you can make their mistakes less impactful by doing your job better. I suggest getting Vi any time she's not banned. Super easy to carry with. Panth is pretty decent and if you put in the time with lee sin you can snowball a game real easy but you have to know how to use your power and translate it into objectives.
IF you aren't getting objectives w/ your kills you are not carrying the game and not doing a good job in the jungle. Anyways, hope that helps you.