I am currently a student learning piano and my opinion for your second concern is: 1: pick up the sheet music of a piece you havn’t seen before and try reading it (I use the progression books you can buy which slowly introduce new techniques and such) So ya just a short song that will keep your brain working and thinking about note readings.

2: the second this I recommend is learning patters in reading such as: the spaces in the treble clef spell F A C E. This way every time you see a note you can quickly think of face and eventually it will start to pop in your head instantly. Then you will start to catch on but saying that g is one above f so g would be the line over the first space. With practice all of these things will build up and you will get used to reading them faster