Why am I stuck in silver

Probably same reason I am stuck at Silver-low Gold, poor decision making and average mechanical skills. Can't really gain anything from just looking at your Match History because every game is different. Need a higher elo person to watch your games and talk you through your mistakes. You can pay for a high elo coach to teach you how to play the game if you really want to get better. Although I am sure you could probably find someone willing to do it just for fun.

Taking paid lessons is worthwhile. It only took a couple to get me from low bronze to mid silver.

I'm no jg main so I can't really say how to improve in that respect other than to try to get your laners fed. If you can't help a lane from getting camped, try to get ahead on objectives on the other side of the map, like a good gank on top lane to get first tower blood or rift herald while bots getting rekt, or vice versa. In my experience, mechanics aren't always the problem in silver and bronze but rather knowing when and where to take objectives, and even more so knowing how to prioritize objectives over kills.

Make sure that you think about what you did in a bad game vs a good game. Were you flaming your teammates? Did you get tilted over a counter jungle? How and why did you take that first tower last game? Were you warding, and were they in the right places to see the enemy jungler or a rotating mid laner?

It's hard to tell what really happens in a game from just the end game stats, but there are many aspects that you can ask yourself and answer yourself just by reflecting on how a previous game went. Look at what you did, not about how awful the feeding top laner was because those things happen a lot. Playing your best game, free of toxicity on your part is often the best way to help your team win because you can't control the other players in the game, but you can control you.

usually people are in the rank/elo they are cuz that is where they belong

Doesnt look like youre really even involved in the games.

As jungle - Very low KDA and low kill participation, especially in jungle so you probably just AFK farm and dont gank or invade enough. Super low ward placement so you and your team getting caught out while you're not being aware of their jungler. Also some champs youre buying 10+ pots (Lee & Khaziz wtf?! both have huge self sustain) or late 18+ min hunters pots. Huge waste of gold and delays builds. learn to kite to reduce damage taken or use the champ properly?? Learn to build properly too. Go read some guides.

In other lanes youre buying a disgustingly massive amounts of pots or cookies too when they dont even do that much mid and late game. Do you just stand and shoot to trade in fights?? Get items earlier, shove power spikes to get kills better

It's tough to tell just from your match history. If you want I spectate a couple games and help give you advice.

250 Wins - 259 Losses. Looks like you're exactly where you belong.

Well in the bright side of you don't belong in silver you should be able to climb out of silver with no problem. Sorry about your placements :/