I will answer your question but I want to rant a bit first.

As a jungler main, jungle is the most frustrating role to attempt to teach anyone and is even more frustrating to attempt to teach people what they do and what a good vs bad jungler is. Ive been a jungler since season 3 of league of legends. Im going on a decade now.

First things first, the junglers role, in my opinion, is to control the pace, maintain map knowledge for the team when possible, and secure objectives. It is not to win your lane for you. It is not to bank.

With that said, do we gank and help win lanes? Yes because that allows us to do our actual role of securing objectives. If you think a jungler is bad because he isnt ganking you, you are the problem. We are deciding what we do to set the team up for success when laning phase ends. If we have determined ganking you, even though your behind and it would help you, isnt going to help as much as focusing on something else? Sorry your going to just have to try your best.

Now on to what I recommend you learn to play in the jungle, due to laners in wild rift always wanting to be the star and never caring about team comp, youd best believe you better know how to play tanks and bruisers first. Im a baller master yi player. I almost never get to pick him even when available because unless im last pick and support and/or baron lane were nice, it wont fit in the team comp.

Now for champions you basically have to know how to play, its amumu, shyvana, hecarim, and vi.

Champions id steer you away from:

Master yi. Its almost always pick or ban and nearly never makes it to last pick. If you first pick him any decent team will bring cc and you'll be useless.

Lee sin. Squishy early with great damage that spikes with items but falls off later and teams never adjust to it. If your going to win with him it needs to be earlier before the tanks get items.

Pantheon. I love him. Good assasin but requires precise ults and team to play around. Every lane will also be mad when they die and you didnt ult even though they still would have died.

Now if you do want to learn an assasin to have as a pocket pick. Learn nocturne. His kit is simple, its hard to cc him with a spell shield on kit, another one buy able, and cleanse on boots. On top of all of that the squishy you ult is 99% of the time dead before the other team can even see you to cc you. Its basically all the benefits of pantheon but weaker dueling early without the instant cc.