You can try and allow your IP address in your droplet’s firewall.
Please try with the following lines
iptables -A INPUT -p tcp -s XXX.XXX.XXX.XXX -j ACCEPT
iptables -A OUTPUT -p tcp -d XXX.XXX.XXX.XXX -j ACCEPT
You can replace XXX.XXX.XXX.XXX with your own personal IP address. To get your own IP address, click here
As soon as you’ve added your IP, save the iptables configuration
If you wish to read more on Iptables and how to use them, you can check this DO article - Iptables Essentials
Iptables is the software firewall that is included with most Linux distributions by default. This cheat sheet-style guide provides a quick reference to iptables commands that will create firewall rules are useful in common, everyday scenarios. This includes iptables examples of allowing and blocking various services by port, network interface, and source IP address.