I need a better line to play against the french defense

@MrBongcloud
Black, your opponent, 200 rating points less, offered a draw and you accepted.
Why accept a draw with so many pieces on the board ? Just play on, lots of time in a correspondence game.
Top players are skilled to play on, look at Carlsen, winning in "drawish" positions.

If you like the exchange line (Do you prefer open positions vs. closed positions ?), an early c4 is interesting to look at.
Another line to try is 1.e4 e6 2.d4 d5 3.Bd3 An otb chess club player I know plays it all the time with good results. The idea is to keep the LSB on the f3 b7 diagonal, to have some pressure against the black queen side.

I play e5 after d5 in French
Won with murderous attacks thrice

@achja My opponent is not actually 200 points less than me. If you see all of his/her other ratings, you probably will realize that my opponent is quite a bit better than me (literally at 1900-2100 in all other ratings), but his/her correspondence rating is underrated.

@tpr yea black players hate easy equality, they really want to feel the pressue

1.e4 e6 2.d4 d5 3.Bd3 is a SOS recommendation (Jeroen Bosch, Secrets of Opening Surprises).

Furthermore, you can go 2.d3 KIA style like Big Bobby did. Or Qe2 Sarg0n style.

@MrBongcloud
Okay, is that the reason you accepted the draw ? :-)

I've gone through a few French Defense opening books on chessable.com (One by a GM, another by a NM).
GM Harikrishna actually recommends the exchange French for white !
You just need to make sure to keep the position dynamic (The NM writes this actually in the exchange chapter of the French book for black). In your game you played a bit passive, you went for exchanges yourself (on f4) and for similar structure and then you resigned to an early draw. Simply play on till bare kings. That might be a challenge for a learning process for yourself.

@Sarg0n 3. Bd3 works, but not so much in correspondence games, where opening surprise can be almost entirely eliminated by the opening book.

@MrBongcloud
You asked for advice (and got lots of) but your replies seems just arguing. Why don't you try a few of the recommendations first and see how it works out for your chess game content and results ?

@achja What do you mean? I'm just asking why one piece of advice works/trying to (as you call it, "argue") "argue", not all of it.

@MrBongcloud

Here an example where you reject advice :
>> @Sarg0n 3. Bd3 works, but not so much in correspondence games, where opening surprise can be almost entirely eliminated by the opening book.

You are maybe overrating your opponents and the opening book here.
Try out new ideas first, and see what works for you. What you like and what suits your style and skills.
That way you are also focusing on yourself, which is good.