Photon is my favorite archetype and has a lot of possible strategies.
The main goal is to summon
Number 62 with
Galaxy Eyes Photon Dragon and
Galaxy Eyes Afterglow Dragon. If you summon Number 62 with those materials,
you will be able to OTK. Once you have Number 62, in the battle phase, use it's effect detaching the Afterglow Dragon, and then use the effect of that dragon.
If you want a different strategy, you can also summon the
Cyber Dragons with the
Galaxy Soldiers.
You can summon the photon dragon with the
Photon Tokens and with the
Galaxy Spell cards, or xys summoning the
Starliege Photon Blast Dragon.