Move a Server from AWS to Reserved instance or to Digital Ocean to save cost

HI I have a server small server running t2. medium ONDEMAND with 25GB SSD connected to a MONGO DB on AWS and i would like to move it to a reserved instance or to digital ocean to save cost. You must be an expert in both system and should give me an estimated of the cost saving before proceeding. Last month bill is attached so you can see which services have been utilized.

CICD pipeline should be set

Cost for this is 100 USD