Which Opening develops the Queen side?

I think your main problem is not responding to threats and hanging material. You seem to be good at setting objectives going forward, but don't recognise what the other player is able to do on their turn. It is a common problem through the levels. You need to be able to spot the basic tactics and not hang pieces. If a piece is in your half of the board, or attacking something in your half of the board you need to either take the piece, trade it off, or control it by limiting its movement. Don't worry about the statement about the queen side. You develop all your pieces which is good and I see you often castle queen side, so, Kb1 and a3 should be moves you consider at some point for safety, but if you castle queen side and the other player castles kingside then pawn storm advances on the castled position are common for both sides and the castler kings will feel cramped. Just know not to allow pawn breaks on front of the king and how to push past the pawns.

Time, space and initiative are things to consider as well. For example, say you are playing a Sicilian Defense that sees White play 0-0-0 while Black plays 0-0. If you look at the pawn chains, White is throwing everything at the Kingside and usually has a pawn storm and a battery on the c1-h6 diagonal while Black wants to hit at c3 to weaken the a file or c2 and will have pieces and pawns pointed so. That is your space factor: an army functions better where they have more room to attack. Second, since opposite side castling leads to attacking on both wings by the players (again White on the Kingside Black on the Queen side), time is of the essence. You have to be able to maneuver your pieces while defending against your opponent. So it becomes important to focus on defending the moves that directly threaten your King and then resume your own attack. If it is not a direct threat, continue with the attack plan. Finally, if you can keep your opponent on his heels with your attacks, you are said to have the initiative in a broad sense. If you maintain a solid attack, your opponents cannot launch any counter offensive. If you falter and give ground, your opponent gets a chance to attack your position as well. All that being said, I agree that incorporating the moves Kb2 and a3 are critical to securing the King that castles long since there is one extra square to defend at a and the King can slide over to do so. a3 allows an escape square for White and becomes a stronger point than b1 if the Queen and LSB are off the board. a3 also blunts Nb4+ if the King goes to a2.

ALL openings allow a player to develop both the kingside and the queenside pieces.

A problem that some beginners have is that they try to attack before they have developed all their pieces and castled. For example, if they try for a Scholars Mate, their opponent drives back their Queen and Bishop.; and because they are retreating these pieces while their opponent is developing, they fall far behind in development.

A piece of advice I give to students is to develop every piece and castle, before looking for an attack.

@NM Mikeweir that was a hard lesson to learn but once I did, my play seriously improved.