e7 bishop in Sicilian Najdorf

Indeed. Instead of the Sicilian Najdorf, you should try out the Sicilian Taimamov... it's very solid and may have relatable experiences for you transitioning from the French. Just saying. Best wishes✌🏽

Playing Black is different from playing White. As the second player you have to make some concessions in the opening, assuming that White doesn't shift his knight between f3 and g1 for multiple times. In the French defence Black have to live with the French bishop and a chronic lack of space, while in the Najdorf there's the backward d6-pawn and a bishop tied up to defensive duties.
All said, if you're really fed up with passive bishops, you may try something like the Dragon and the Sveshnikov, although these openings don't offer more counter-attacking potentials than the Najdorf.

One point that players tend to underestimate is that the free development of all the pieces often leads to mass exchanges of material, a quick release of the tension and a rather drawish game. Restricted development tends to also restrict the number of exchanges, which preserves the tension and retains winning (and losing) chances.
That "passive" e7 Bishop might pop out later, and turn into a monster. Consider Black's dark-square Bishop in this game:
https://www.chess.com/forum/view/game-showcase/a-heroic-defense-in-the-sicilian-najdorf-kids-dont-try-this-at-home
Or this e7 Bishop:
The bishop on e7 is black's most important defender and often has clear tactical threats or tactical lines from the start. There is no comparison to black's notoriously bad bishop in the french.
"passive" is only bad if there are like 4 pieces defending something. One piece by itself performing a defending role is vital in almost every black opening.