TeamFight Tactics - Mid to late game advice

Hello, When playing teamfight tactics i usually start very well, with a Wild / Sorcerer / Shapeshifter pack. Mostly focussing on WW, Nidalee, Ahri, Gnar. However, i notice that in the mid- to endgame, i am allways overpowered, right now i keep spending a lot of gold on refreshing, hoping to get my existing champs to 3, but that doesnt really seem to work. What is the best tactic for mid- late game when the champs you need are not on the board? Put money towards levels? Or keep refreshing? Right now i allways finish in the 3-5 range. Regards
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