With white's preponderance of forces on the left side, perhaps b4 cxb4 axb4 followed by Reb1 would achieve a breakthrough. Black would have to respond with Rf7 and perhaps move the bishop to F8 to maneuver and assist.
The Process of Decision Making in Chess Volume 2: Practice positions and solutions. Position 8.10
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I would look towards creating a passed pawn with either the b or c pawn. A piece sacrifice to create a pair of passed pawns could be in order. Blacks Bishop is out of play until the f8 rook moves.. I would start with the move b4. Any other move gives black time to move the f8 rook and then the bishop over to f8 to defend c5.
i think that white has it pieces on the queenside and that gives white an advantage with the initiative, and blacks dark square bishops needs to use some moves to get into the game that gives white a small advantage to build a little on
Solve for white:
Diagram 8.10- black has a nice space advantage due to his dark square pawn chains. The problem is, however, that this also severely reduces the global quality of his bishop.
Challenge: does the fact that black’s bishop is bad and the d5 knight is so beautifully placed mean that white has a real advantage (that can be used to create further progress)?