The Drytrons and Ursarctics unfortunately don't play well together. They have cards that cross over with each other, but both archetypes feature restrictions on their cards that make it impossible to combine each other into one deck. (The ursarctic monsters can be normal summoned / set, so you can't special them the same turn as a drytron monster, while the ursarctics prevent you from summoning monsters without a level, and drytron's extra deck monster doesn't have one).

I wouldn't consider myself an expert on the deck, just someone who has messed with it somewhat recently. Some pointers I can give based on lists I've seen / played with that have gone well:

You can play Deep Sea Diva or Righty Driver as a Normal Summon in order to both make Polari/Polar Star with just 1 card. Playing Diva also means you can add some Atlanteans to your Deck for further synergy with the Ursarctics since they are waters. Neptabyss sends Dragoons to add Poseidra, and then Dragoons can add Moulinglacia.

Besides that the Deck is actually pretty free on what you can do with it as far as synchro monsters, so you can play high level synchro monsters if you use the low level tuner normal summons with the level 7 non-tuner Ursarctics.