Tip for climbing lower elo - the correct time to surrender.
Not all games are winnable. You may need to surrender one to avoid going on tilt and to avoid wasting time. However, that risks throwing away a chance for a turnaround. Nonetheless, there are times where you should surrender.
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If the score is 5-20 or something in 20 minutes, but the enemy has an early game comp while you have waveclear and an ADC that doesn't fall off compared to theirs (lets say you had Cait and they had Draven), DO NOT surrender. You can turtle and come back. The key is to maintain vision in your own jungle and collapse on any warding supports, junglers or mids. Gold will be scarce, so direct them towards 1.) your primary waveclearer and 2.) your ADC. Build tanky. Make catches. If you lose vision control of your own jungle, you will lose the game
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On the other hand, if the score is 15-20 in 20 minutes, but you just got aced as an early game comp like

and the enemy comp is something like
, then I would consider surrender. You had your chance to suppress the enemy team, you failed and not only failed, actually fell behind, and it will only get worse from here. -
The only time I start a surrender vote is when we lose control of vision in our own jungle before 20 minutes, and cannot re-establish it due to dying whenever we step out of base. There is no point; if you lose vision of your own jungle and both mid and a side lane inner is down, you can't even farm and can't contest any possible objectives. Even if you miraculously ace the enemy team they still are at an advantage.
Rule of thumb: if theoretically acing the enemy team twice still can't let you come back at this point, then surrender.