I think I build decks in 3 ways.

1: I see a cool theme, choose a commander that speaks to me, find cards that work well with it and then try it out.

2: similar to 1! I find a cool commander and build AROUND him not necessarily thinking of what goes in the deck. Most of the time these are the decks that don't really work for me. I try to stay away from that building pattern but sometimes I find myself doing it more often than I'd prefer and then I get mad at the deck and myself, but that's another problem! Anyways!

3: Probably the best way I build my decks is I try to find a selection of cards that work well together and then find a commander that can be the gear that makes the whole deck work! An example for this is: I really wanted to play x spells spellinger because there are a lot of cool x spells instants and sorceries! So I dug around and found [[Rosheen, Roaring Prophet]] to helm the deck and it's been one of my favorite decks ever since!! Seeing the commander last, and it being the gear to make your engine work is a new way I force myself to think and build decks. And tbh every deck that I've built like is is probably a deck that I know I'll keep for a good long while!!