Shall I turn on strip leds to my existing panel to 4 week old auto? Help plz

Any extra light will help you. I would probably just grab another light like what you have already

I'm a noob but i'd go full spectrum there's some benefits to adding blue during flowering ( I believe although I tried a google search and not sure what that was exactly, in veg it helps nodes grow tighter) but you have limited lights it seems, so me personally id go full, the Sun is a even fuller spectrum so if anything you're just helping it be closer to the full spectrum. When I flower i have a 1000HPS(red spectrum typically for flower) I'm going to use, but im going to use my 600w MH(bluer spectrum typically for veg) If you had more access to lights and blue light (wattage) i probably wouldn't comment, but since you seem to have limited light I'd for sure go all out. But again I'm a noob so idk really gl