For reference, here's my first attempt at M101 with exactly the same hardware (and twice as much scope time).
Between my first and latest attempt I adopted/learned about:
- BlurX, NoiseX, and StarX
- Binning
- Drizzling
- Sensor gain
- Background extraction in PI
- Dark Flats
- Various other PI things
Don't let the limitations of your hardware stop you. There's always something more to learn.