Is that your current setup? That rear mech already looks far too stretched as it is let alone with a bigger chainring. Did it come like that it did you set it up? The front mech actually looks too high above the large chainring (gap between large chainring and bottom edge of front mech cage should be about 1-2mm).
Anyway, look up the specs of your derailleurs and see what the max tooth capacity is. If the extra teeth you want to put on the front chainring is still
within their capacity then you can just change the big ring and leave everything else as it is, apart from the chain which needs more links.
(Any 4 hole chainring with the right BCD will work)