Grabe ka naman sa sarili mo OP. Valid yung nafefeel mo pero meron kang hindi vinavalue, yung logical thinking mo and how you survived 6 years with building the project without mastery of those languages na you shared. Other than being really good at a particular language, mas favorable pa rin for me yung alam mo kung pano bumuo from different resources, and most important, alam mo bakit mo yun ginagawa. Paradigms and architecture.

You have two options, either mag specialize ka talaga into programming or mag tech lead ka, like managerial path if you really want to get that high salary. Meron naman tech lead na nagcocode pa rin, pero mas focus nila is high level design and to have their team smoothsailing.