This phase of the Pinnacle should be relatively easy for most people! For Rounds 6 and 8 there are enough F2P pieces that you can use to clear without necessarily pulling. Always remember to make sure you're using all the slots during the challenges (5 main pieces + 5 accessories) in order to maximize your score. If you need just that extra bit of score point to get the perfect, then look into investing in the styling nodes of your Shard: Sea of Stars in the Heart of Infinity. Those nodes work across all regions and are incredibly helpful!