c5
second opening?

The Catalan Opening. You can play it against the Nimzo-Indian, Queen's Indian, Semi-Slav, and Queen's Gambit Declined. Maybe against the Slav too, I don't know.
It's fun, and easy to reach. You dominate the queenside, and you call the shots. Suited for more positional players (a favorite of Gelfand).
In the highest levels (GMs), it's a drawish opening, I don't think I had One draw with it.

If your opponent play the King's Indian - I recommend a Sämisch Variation with a queen-bishop battery to take away his fianchettoed bishop. slow, but your attack will be good.
Samisch:
https://www.youtube.com/watch?v=tVuW0PvUh9c
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If you care much for king-safety, the best is the Fianchetto Variation:
https://www.youtube.com/watch?v=S6shy_j-5IA&t=187s
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I understand that what you ask for, is a repertoire for a d4 / c4 player? Am I right? I'm not so young too - I'm 38. Contact me if you wish.
Basic Colle transition to Queen Gambit Decline although it's still really a Colle style opening. In a perfect world, your moves are d4, Nf3, e3 (that's the end of the basic Colle), c4 (now it's a Queen Gambit declined), Nc3, Be2 or Bd3, then castle short. A whole bunch of trades happen on the c-e files and your at the end game. This is wicked against the Dutch and Indian defenses and you should never have a closed game.
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Opening study is useless at your level. Study of a second opening makes even less sense.
Just apply opening principles, focus on blunder prevention and tactics.

I disagree. IM Levy Rozman (Gotham Chess) explained that you can learn openings at any level. Though I must agree with you on the second opening.
I agree with the Grandmaster.
https://www.youtube.com/watch?v=WPIMRMl0guA
I followed all of the dialogue between ChesswithNickolay and Toad and I have to say I found it very fun and refreshing to see, 2 people in the internet with different views about chess that try to argue peacefully without insulting each others is very rare nowadays. I agree with Nickolay in the sense that the Queen's Gambit is an awesome opening and its very difficult for Black to defend properly. I'm currently studying a lot of 1. e4 for White in depth so that when I'm done with my openings I can focus exclusively on middle-games, tactics, strategy and endgames but I will consider studying the Queen's Gambit more deeply when I will feel like I need more strategy in my games

no one has ever played the London against me.
Lucky you. Although, Agadamatar's anti-London course on Chessable is amazing. You should check it out before you bump into those pathetic London players

Queen's Gambit was the opening that got me out of my rating drop. I read a whole book on the Queen's Gambit and created a study out of it that includes theory and games. You can check it out here
EKAFC you created a study that contains lines from a books? Is it all lines? half? A quarter? I want to expand my knowledge of the Queen's Gambit but I want to use my money for other courses at the moment

and also is it a complete d4 repertoire or does it start after 2 c4?
If you checked it out, you would see that it has lines and games all of which are annotated by a grandmaster and most of the games start with d4 while the others transpose into the openings mentioned. It is not a complete repertoire as it doesn't cover the Indian Defenses but I did read the author's other book about the Indian Defense which I linked to the Queen's Gambit study or you can view here.
The author is so good, he inspired Gotham Chess to play the Caro-Kann and get back into competitive chess. I play French so I am probably not going to read the book for the time being but if you are interested in the French, my study is here although it doesn't have any Classical (Nc3) opening preparation but even at 1500 blitz, hardly anyone places it anyway.
These are all free so if you want to pay for other resources, go ahead. You don't like them, that's fine but you should consider looking at them before you invest
f5 is a mistake if black has not castles. knight b5 threatening to trap blacks took paralyzes blacks queenside the knight has to move to the edge and the bishop and knight control blacks queenside