You can vary this sequence in many ways by getting the fingers to play in a different order.
Nowadays, many acoustic players have discovered the benefits of using both a pick and fingers. The pick naturally gives you more volume, which helps to drive your bass lines along confidently, whilst the fingers can often add more detail than just using a pick.
As a general rule, use the pick to replace any notes that were played by the thumb and first finger. The action of your 2nd and 3rd fingers will remain the same. Armed with these techniques and a handful of chords you’ll be surprised at how much you can achieve. Many hit songs have been written in this way!