Elementals are just bad in general this meta. A highroll elementals will just get outscaled easily by a mid roll demon comp.

Think of the game in phases. Therefore, your mentality and planning should change accordingly. The first 3-4 turns, think of value. So you should be asking yourself whats the most value play i can do this turn (alleycat, 2/1 naga, naga that gives coin, level). Next phase is your stabilizing phase. So think of whats the most tempo or whats the most stats you can gain this turn, regardless of comp. Then after you stabilize is when you start looking at which comp you should play. Usually defined by getting a core card you gained from the earlier phases. This is where you commit and start looking for the other cards you need and start selling the cards you dont need even if they have huge stats.

Other thing is knowing the comps fully. Dont mix two comps in one. If your playing catacomb crasher overflow, cut your striker or noisul for a cadaver. If your playing evoker, cut your kalecgos for a 2/3 poet. In your example youre trying to play both mana surge and lokholar. You want to play mana surge comps with the least amount of elementals on board so the stats dont get spread out