What to play?

I think g4-g5 is a great idea and then a rook lift, but then he can take on a2 and make our rook dumb so either hide the bishop on b1 and play c3 and d4 or take on f7, though it looks like taking on f7 is better since all of our pawns are on light squares. It seems like there are no tactics so just positional play. Time is not important here so white can decide when he/she has all of his pieces improved to their best spot. Black is very cramped here and has nothing to do. At first I thought of Bh6 but he can just ignore it so it wasn't a good move. Maybe I am not seeing something that can just smash blacks fortress or is it just positional play like I said with take on f7 and g4 and rook lift?

@tpr Well my original plan was to play c5 after c4 at some point when I would think I can gain something from it. And If I really wanted my bishop at d1 I would certainly not play Bb1 but Bb3 (After activating bishop and rook so that b5 wouldn t be that annoying).

Hold on tight, the shocker:

Capablanca played c4!

The whole game:

Capablanca playing Bird's Opening and King's Gambit.
Two names for black players.
This must have been an exhibition/simultaneous/casual game.
Yes now I get the c4: he keeps black bottled up. It is sort of prophylaxis pre-Nimzovich. Black re-opened the diagonal himself with 19...b5 and 22....bxc4, so that Ba2 came to life with 25 Bxc4.