Stop saving smite ONLY for objectives/buffs, smiting players to slow them and deal easy damage can do you wonders for getting kills during ganks, I myself have gotten plenty of kills just from smiting people.
play 1 or 2 champs for i prefer playing 1 champ
duo : play only with mid or adc mains
watch a good jngl players ( pro players / streamers ) and try to learn from them ( macro / decision making )
always be aware of the enemy jungle, if any lane of yours is losing a lot, focus on the lane that is winning, if all lanes are losing be with a jungle carry or you will lose the game.
- Beginner? Don't duo play, learn about the game in unranked matches first.
- Duo only mid and jungle or mid and top, as the chances of you winning the match are much higher in these settings.
- Play with only 3 champions, more than that will mechanically fail you. Nobody is good with everything.
- Use /muteall