The problem is that seeing the spirits and hearing their voices audibly can lead us very, very easily to become proud. God only gives such graces to very, very humble souls, because otherwise it would destroy us. Pride leads to us elevating ourselves and is always very destructive
So what you should do is venerate your angel through prayer, while simultaneously praying for humility, not apparitions. As you pray more for humility, you’ll also probably find yourself more content with what God has given you and more thankful for His will, which is what you rest in now.
I used to pray for apparitions too, but it wasn’t a good idea. I was praying as I was in order to have really cool experiences, but it was all deeply self-glorifying, not glorifying God. If God had answered my prayer, I would have immediately become a thousand times more proud. I was making some very bad mistakes at that time, but I had a heart of sincerely desiring God, so He protected me and eventually led me out of my errors. Anyway, don’t seek that, but pray for increased gratitude for what God has given you and for greater humility (something all Christians, even if they’re saints, should always be praying for), and simultaneously venerate, thank, pray to and praise your angel and God through him through prayer.
May God and your angel bless you

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