Wǒ yǐjīng bǎ jiànyì tí le, zuìzhōng juédìng xītīngzūnbiàn.
I've offered my suggestions; the final decision is entirely up to you.
Tips
usage
Polite-formal idiom. Tone can be genuinely deferential ('whatever you decide is fine') OR coolly resigned ('do whatever, I'm done caring') — context and delivery decide which.
memory
Parse it as 悉 (xī — 'entirely') + 听 (tīng — 'obey / let') + 尊便 (zūnbiàn — 'your honored convenience'): 'I entirely defer to your convenience.'
