Potential Rating Gain if Only 20 OTB Games Per Year Context:  I'm returning to the game after more than 25 years away!  I only got back into it because my 8-year old son joined his elementary school chess club.  They all got accounts to chesskid.com.  Which in turn is parented by chess.com.  I clicked on chess.com to see what that was about, and blam!  I was swallowed up into the matrix again!

Anyways, there's not a lot of tournaments where I live, and I went to the Senior Open and talked to the TD.  (To show how out of touch I was and still am, I asked him what that electronic device was that some of the players had.  He said it was a play counter.  I said, "What?"  And "how much?"  

So I said that I used to play, and do I have to come back as an Unrated since I haven't played since the late 80's?  He said no, you always have your rating.  He looked me up, and said that I have a 1762 rating!!!  I was astonished.  All these years I thought I was at best a Class C patzer.  

I was astonished, and now I want to make Expert before I die.  (I'm in my mid 50's).  But as mentioned, there's not a lot of OTB games where I live PLUS I work and have kids and I do a lot of stuff with my 8-year old.

So I anticipate at best 20 tournament games a year.  If I finish +4 against all rating classes that I get paired up against (Assuming an effective study plan), how many rating points can I gain, roughly in a year by playing 20 tournament games?
I went to the FIDE rating calculator and inputted:


Your ELO of 1762
An estimate of your opponent's ELO of 1750 (assuming you play roughly equal opposition)
The development coefficient of 20 (representing that you have an established rating)


Per game you get a rounded rating change of:


+10 for a win
0 for a draw
-10 for a loss


At +4 in 20 games, your rating will change by +40 (4 wins to 16 draws) to -120 (4 wins, 16 losses).