Try OpenVPN on DigitalOcean

[MakarandMane]

https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-18-04

1. Install OpenVPN on digitalOcean.
2. Add user
3. try to connect Office and outside office using DO openVpn
4. Speed test

[MakarandMane]

https://www.comparitech.com/net-admin/dynamic-dns-providers/
https://www.maketecheasier.com/best-dynamic-dns-providers/
https://help.ubuntu.com/community/DynamicDNS