Hi, Rene. Thanks for the comment! I really hope you are well-occupied as you work through some new tunes.
As far as advice I could give you for bow exercises, that really is the life-long pursuit of a violinist/fiddler. One idea I would suggest is to pick a paticular slur pattern you’d like to master and start playing it over a scale…then modulate the scale up. Play the slur both down bow and up bow as you alternate notes up the scale. That’s one way to really dial something in. Another idea is to learn one of the advanced versions of a waltz on this site and play it the same way (including bowing) each time. This will allow you to key in on any rough spots and work them out. A good rule of thumb is that for every wrong or rough time you play a lick, go back and play it right 4 times. By keying in like this, you end up perfecting a difficult technique.
Aside from those ideas, I would highly recommend working your way through all of the bow and right hand technique videos on this site. I cover a bunch of really good exercises which are fundamental in getting your playing to the next level. Keep us posted!!!