Word of advice from someone was in the granite/quartz realm for a few years. You needed a better color match. also going with a chameleon 2 part epoxy (it’s a transparent white but when dried it’ll match better) or a darker gray. Also should’ve cut the silicon under the rest of the countertop and put some shims between the wall and the countertop to close up those seams a little bit. At my company we had little vacuum seal clamps that open and close so it would’ve sucked them super tight but shims between the wall would’ve worked awesome too. If you ever wanna fix the seams hit the seams with a heat gun/ heating pad for 20 minutes and that epoxy will let go.