Which scrum/agile methodologies would you suggest in order to complete tasks successfully?

Scrum provides a structured framework with sprints and regular reviews, while Kanban offers a visual approach for continuous workflow management. Choose based on project needs and team dynamics.

Check out the Personal Kanban. For many cases it is more than enough. You give visibility to your activities, can see progress by moving them downstream and you can control the amount of work you really can do. https://www.personalkanban.com/

I'm personally using Kanban