Clickup is easy to use, with lots of features and a great UI. Clickup has an affordable subscription model suitable for single seat personal use if you choose to upgrade for more features. Sometimes the more complex features are a little confusing but there's a lot of documentation and tutorials online to help you. I doubt there's a more sophisticated task/project management solution.
We are using the Digital Ocean App Platform as an afforable continuous deployment and hosting solution for the Whyp frontend which uses server-sided rendering. We used PM2 on a linux machine for a long time but eventually moved away from that as it's not as easy to scale/monitor as the cloud.