Transfer 3

What do you think about transferring 3 frozen embryos at 35? There one frozen by itself that I'm set on. There's another pair as well i was wondering if I could transfer. I don't want to thaw and refreeze one from the pair. Terrified to do all this and not be pregnant. Worried about shut downs next year. Idk my dr would even agree. I know she's ok with transferring my pair but the single one is "technically" better. What can I do to optimize my chances? Lining check in a couple days, transfer soon! Also any encouragement for single embryo transfer? Tia. Best wishes to everyone in this group ❤!