Limited play is a format where players build decks from packs of cards that they open at the same time
For your first-ever Commander game, a four-player game is usually the sweet spot
When you're tempted by The Ring but it already has all its abilities, you'll still be able to chose a new or existing Ring-bearer which will then get (or keep) all of The Rings abilities
This ability allows Selesnya decks to adapt to nearly any situation, providing access to crucial legendary creatures, artifacts, or lands exactly when they're needed
However, I was tinkering around with the deck a little more to address the weaknesses you stated, and I think I've made a deck list that could possibly hold its ground better against a lot of the decks you play tested mine against
Unfortunately the format revolves heavily around Greasefang, so expect maindeck graveyard hate and more coming from the sideboard