Do you just want to increase your rating, or also improve your play?

Whichever you desire, your rating will always increase, as long as you score more than 50%.
Now is the best time to increase your rating, because provisional players have a low ‘experience’ . Your ‘experience’ is the sum total of all match points played(or simply the number of games played if you only play 1 point matches).

Important, because having a low ‘experience’ (of 400 or less) is a key factor in the calculations for rating points won or lost in a game: an ‘experience’ of 0 will multiply gains/losses by a factor of 5, compared to someone with ‘experience’ of 400 or more.

While your experience is less than 400, and assuming you score more than 50%, you can maximise your rating point gains by playing only 1 point matches: these will gain you between 10 (against an equally rated opponent) and 2 (against a 3500 rated opponent) rating points per game, whilst at the same time keeping your experience low.

Once your ‘experience’ reaches 400, it is a different story. Then it is best to play 101 point matches (where you only play 1 game and double consecutively until the cube reaches 128) against opponents whose ratings are within 200 points of yours.
These can earn between 20 and 3 rating points per game, depending on the rating difference.

If your opponent is rated more than 200 points higher or lower than you, it is best to play 2 point games, and ‘doubling’ on your first move.
These only earn a maximum of 3 points.