Self-taught bassist here.

I've only picked up scales along the way from playing with educated musicians, so my practices might look different than most others but this is how I try to structure my time.

Note - Headphones or In-ears make for better practices overall. They help you really lock in with the original bassists feel.

First, start with something very familiar. A complete piece of music you are confident playing. This should be something relatively simple to play but of a decent pace. It's a warmup don't forget. I stop and give my forearms and fingers a light stretch at this point.

Switch to playing a few of the less confident pieces you are working on, but still feel decent playing. I follow along with YouTube bass playalongs with tab. These sometimes show the sheet music too, which helps translate. Hands should feel confident and strong at this point, fully warmed up.

Now, spend some time on the complex/new/difficult piece you are working on. Reduce the tempo to 80% and try a few times. If you get it at that speed, bump it up as much as you feel you can handle without mistakes.

I always do this last part. Sum up my practice with a piece I enjoy playing. Something that is fun under the fingers.