You might want to try to lower your expectations of yourself a bit.
If you haven’t been davening you need to make davening/speaking with H’sh-em meaningful. Aim small with your goals and try to keep that up for a day or two and see how that feels. Think about what’s meaningful to you, what you hope for or need help with and then try to find tehillim that have some common language with those ideas. Also, you might want to temporarily choose the most primary tefilos instead of saying the entire psukei d’zimra, which requires a much bigger commitment of time and energy.