with out watching what you are doing its hard to say...
people saying playing supports or tanks makes it harder to carry on and climb... because you are so team reliant on winning and cant hard carry with these type of champs...
but it can be cuz you are bronze and you havent yet learned all the skills and things you need to know to not be bronze
but like mecha malphite stated its hard to tell ...
just a quick look at your op.gg page of your last few games, items, builds, runes and masteries some of your builds are ok. cs needs to be better. im not a huge fan of your runes or masteries... i think they could be optimized
but mainly... find some streamers who play champs/roles you wanna play... learn from them, ( however what works in high elo isnt always the same in lower ) it be best to start with the fundamentals of the games , csing, positioning, map awareness, rotations... playing to win conditions of your team/champs so on...
but sometimes when you have an adc who does no damage... and youre a tank... and they go 3/16/9 and is 2nd lowest damage dealt in game out of 10 players there is something you just cant help... but as a jungler what could you have done to help that adc? maybe gank more? babysit him? peel better? etc ward better? none of us play perfect... its hard to see our own mistakes with out someone else looking at them... so maybe take a moment to reflect on your games and what you did well and bad and try to think what could you do better?
and sometimes you just face better people who played better that game... give some credit to them... not alot but some