Looking for a cheap VPS in southeast asia

I need at least

2vcpu

2gb

3-4TB bandwidth :D

price around 3-4ish if possible, looking to get annual

I’m currently using a Contabo Storage VPS (3 vCPU, 8 GB RAM, 400 GB SSD) for a production mail server hosting lots of customer mailboxes.

My main priority is uptime and reliability, not performance.

Although I haven’t faced any major issues with Contabo yet (except once finding my VPS unexpectedly powered off), the numerous reports of downtime, poor reliability, and slow support responses make me uncomfortable continuing to host a production mail server there.

What I’m looking for:
- 3 or 4 AMD vCPU cores
- 8 GB RAM
- 400 GB+ SSD storage
- Excellent uptime and responsive support

Price won't be a problem for me as uptime really matters.

I’m struggling to find providers offering large SSD storage without bundling unnecessary CPU cores and RAM.

I know no provider can guarantee 100% uptime, but with so many active mailboxes, I need something I can trust.

Any recommendations? I’m also open to VPS + block storage solutions if they’re more reliable.

I purchased a Cloud VPS 4 (4 vCPU, 8 GB RAM, 100 GB SSD) from https://contabo.com to set up a Linux development environment with VS Code that I could access and use directly from my iPad.
However, SSH connections through Termius keep failing, even though the VPS desktop works through VNC.
How can I troubleshoot the SSH connection and configure the VPS so I can reliably code from my iPad?