I left my job recently, which has allowed me to launch and work on Plotapi (https://plotapi.com) full-time.

I was spending 16+ hours a day on the project up until the launch. I organised myself with a local Gitea (https://gitea.com) installation and creating issues that I assigned to myself. I started off using Kanban within Gitea too, but as it was just me, I ended up preferring to use issues directly. Each day was focussed on making progress on the current issue!

I only launched Plotapi 3 days ago, so time will tell how I end up planning the days/weeks!