Your sound quality is pretty good, and you have quite a rich voice which is nice. You don’t sound really like English is your first language though, which may put off some people who are looking for “native” english accents.
Your tone is pretty good, but you only really show 1 type of delivery, which I’d describe as “careful professional” - a tad monotonous, not very energetic, professional read. This definitely isn’t a bad tone to use, but you probably want to show a much wider variety in your reel. You don’t really have anything that sounds super energetic, or anything that sounds more casual/chatty - both of which are things that clients often ask for.
I think you could also work on some of your articulation - a couple of words felt quickly skimmed over. When you said “We apologise, but you have reached us outside of business hours”, it sounded more like “biness hours”. For phone system recordings, you need to make sure everything is very clearly articulated, because the phone line will already distort the audio somewhat and make it harder for the caller to understand.
I think you have some good foundations, and by adding in more variety you will do better. I’d also recommend advertising VO’s in your native language, as this would help supplement any sales lost by people who are looking for “native” sounding speakers. I love your accent, though, so hopefully you won’t get this issue too often!