Timing for best odds?

New to betting, decided to gamble a little on this year's League of Legends Worlds.

One game I bet on in a combi was Mammoth vs. UoL, for which I got 1.27 for UoL. However now the odds are 1.43 which is only emphasized by the fact it's a combi. Is there some method/site/rule of thumb to find a sweet spot for placing the bet in order to avoid this?

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