 If you liked
Party kara Tsuihou sareta Sono Chiyushi, Jitsu wa Saikyou ni Tsuki
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 ...then you might like
A-Rank Party wo Ridatsu shita Ore wa, Moto Oshiego-tachi to Meikyuu Shinbu wo Mezasu.
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Show has a very similar start... MC gets taken for granted in his current party, and ends up leaving the group due to the mistreatment. He ends up partying with a newbie group, and makes his previous group realize too late that that MC was in fact the one carrying the group. He proceeds to cause his new group to excel and grow.
There are some differences of course, but the overall premise is very similar.
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Recommended by floppydjsk