[another long response for novice, just scroll on bye
australia is left hand drive, so left turns are tighter,
right turns across opposite lane have more space
thus easier more forgiving..
similarly roundabouts are right or clockwise..
most are right handed [left brained] thus favour
certain alignments etc from life training..
in traditional karate practice and training etc
all basic techniques are drilled both sides
left,right,left,right many,, reps.. going for
increasing ambidexterity [for starters]..
this is for totally practical reasons
as in self defense etc..
but also, genuine martial arts includes
and is also brain training, all else aside..
sale for riding a motorcycle with skill..
so you have answered your own question
with the obvious; practice,, both sides..
if you cant get your reps up on roundabouts
there is always that no traffic quiet space
for circling, including or specifically
anticlockwise or left turning..
im right handed but seem if anything to prefer
or feel more comfortable with left turns/cornering..
perhaps its the relative novelty, thus interest etc..
enter the figure 8 variant of circling..
no practicing limited to one or favorite side..
practice your circles from rounded off squares
or rectangles, into large circles, then progressively
smaller until very small.. no hurry.. bit by bit..
then do the same the other way..
then repeat from large figure 8's..
the test, or object is -smoothness-
and control.. thus larger to smaller..
slow circling teaches brain continuity
in movement, which gravity cant 'catch'..
if your motorcycle is leaning over to one side,
held up by your extended leg, which slips,
gravity which has been quietly pulling on
your motorcyle simply takes it down..
yet motorcycles or top heavy pushies
at speed can continue around curves
with the forward force of momentum
overriding the pull of gravity..
[visualise that for a moment or two]
thus there must be a combination of speed
and movement/alignment which will allow
'low flying' even at slow speeds..
start with big circles and gradually reduce them
developing technique etc, but also feeling for
your control of ongoing movement..
until it feels natural and good..
then refine it into a riding skill..
even 15mins daily in some quiet traffic free
open flat area [school quadrangle, parking lot etc]
will, bear fruit in even a couple of weeks..
some blokes never seriously practice riding skills..
and often get away with it.. thinking 'i can ride'..
if there was a govt rule on 'no practicing',
everyone would be demanding the right
practicing skills alone in some quiet place
is potentially very enjoyable and most
satisfying.. even on a 250...