How about if White to move play 1. Rf1+. I suppose Black would answer with ...Be7, putting a pin on the Bishop. Then White can move his Queen to somewhere on the King's Knight file in the event Black decides to castle to unpin the Biship, then afterwards White can later play Bh6 taking an advantage of a potention pin on Black's King Knight pawn and go for a mating attack.
If Black to move, yes indeed get the Bishop out if White decides against Qg3. Material is even in this diagram, even with White's underdeveloped Queen Side, Black is worse off so I would suggest the Black considers King Safety. Working on castling short to get out of the way of the Rooks and Queen coming to the back rank. Then after King Safety see which pieces White has that are hanging, or start attacking other weaknesses. Maybe attack the h2 Square
Ok this is not on defensive play, but rather of understanding what your opponent wants to play and then playing against it. After you move, you must have seen all your opponents tactics and his best route of play. You look at your opponents plans and your plans at the same time. You choose a plan in a position, but look at what he wants to do and what he will do against your plan. This is known as prophylaxis in chess. ok here is a position. Now ask yourself what does black want to do next. There are 2 things you should see, he wants to develop his bishop and he wants to play on either the e-file (less logical) or the b-file. Now you can understand what he wants. So can you do anything against his e/b file play, no. Can you do anything against his develop his bishop idea (prevent his bishop from developing) yes u can. Qg3! If your opponent wants to play with ..g6 then he is killed down the e-file.
Now that you will look when you have undefended pieces, look at your hanging pieces, calculate all checks in a position. You should start playing stronger chess. There will be more parts to this, but I think I have given enough to help those weaker then 1300 to improve.