looking for bronze duo to escape the hell

Looking at your match history, you must be one of those "Flash is useless'' type of people

for this elo it is, unless your playing as adc, or against certain champions where you would need a escape.

Please explain to the Plat player how flash is useless.

Trust me, Silver is not much better

must have positive kda in this low elo

Uh... like, I understand that to a point, but KDA is very, well, superficial. Some people might have a lower kda because they focus on objectives, or they play roles where they die more than kill (tanks, supports, etc). I mean, if you account for assists then sure, but a lower death count is always better than a high kill and death count. You should also be looking at cs scores (100 in a 20 minute game is not a good benchmark, depending on the role), what kind of summoner spells they take as warning signs (ignite on support, barrier on adc, a midlaner with smite, etc), and so on and so on.

I mean, it's not a bad requirement, but if kda is one of only two standards, then you're going about it the wrong way. Low death count is optimal (one kill is not worth dying for in the long scheme of things), but the game is more than your kda.