Its not easy to offer good advice as it also depends upon the carb type your eating, its rate of absorption, insulin taken and how/when its administered, time of year then your health too as well as exercise taken before the meal.
Slowly acting carbs will make you go lower after meals, faster acting make you go higher. Also the time you take your insulin before the meal as well as the amount take at that time and if any is also taken as part of a multiwave bolus.
Also at this time of year (spring) as well as later in the year (autumn) there are some of us whose bodies insulin needs seem to change either going up or going down.
There is also health impact, are you well ?, then diabetes control have you been going lower earlier in the day (is this a lower part of a rebound wave).
Diabetes is flipping complicated for all of us to manage and sometimes we don't give ourselves credit for the number of balls we have in the air at any one time to control it.
My suggestion is to try one at a time (for a few days) - the choice is yours, I personally would start with looking at the carb type first (leaving the insulin same) then if this does not fix it after few days then look at insulin dosage and how much plus when its administered.