Solidarity increases the ATK of all monsters you control, if both they and the monsters in your GY have the same original type.
Also, if you’re using one type only, Rivalry of Warlords prevents either player from using more than one monster type as long as its on the board, potentially limiting your opponent’s options in regards to summoning monsters.
If you’re using fusions in an Ancient Gear deck, you can normal summon Cyber Kirin and tribute it, which reduces effect damage taken to zero for the whole turn, and then use Power Bond.
On that note, I’m pretty sure most of the Cyber Dragon fusions don’t have any strict material requirements other than Cyber dragon itself, with the rest being just machine-type monsters.
For Lunalight Cat/Panther Dancer, I would recommend using Horn of the Phantom beast, which increases the equipped monsters ATK by 800, and lets you draw a card every time it destroys an opponent’s monster in battle, such as using either of their effects.
In Endymion’s case, my best advice would be getting Secret Village of the Spellcasters, if it’s in the game, or else use Mega Ton Magical Cannon, which lets you remove 10 spell counters from anywhere on your field, to nuke your opponents entire board.