I am going to assume that you are interested in something different in topic and not just different producers. A couple of thoughts on interesting topics:
Disciples of Selosse
Understanding Terroir through grower Champagne
I would certainly add Champagne Frederic Savart in the list. His top wines are the expression and the Mont Benoit but all of his wines taste really excellent. The wines are elegant, refined and bit more generous than the wines of Chartogne Taillet (even though the latters’ style has changed from the 2016’s on with a rounder freshness making them a bit more approachable young IMO) but not as rich as Krug for example. If you want to get to know his wines try a “l’accomplie”: this is a gold standard champagne for me as it has a perfect balance between freshness and complexity.
For Agrapart try the “mineral” if you don’t know them, it is mid-range in price but the quality is close to l’Avizoise.
Vilmart is also really excellent but these wines need time IMO, many champagnes without malolactic fermentation require a bit more time in bottle than the ones with. At least to my taste as the acidity often sticks out in the early days but this often leads to really beautifull results after 2 years in bottle.
A personal favorite of mine is Jacques Lassaigne - he really likes to experiment a bit and some some very unique cuvees that he does as one time releases.