I'll never have an issue with people who choose to use meta cards or strategies. Online is a competitive mode, and if people want to use their best cards, that is totally okay. I might have issues with SDS' choices of cards and how they shape the meta, but that's a whole other issue.
Anyway, to shake things up, so I'm not always just using 9 switch hitters, I like to use a lineup that has 3 righties, 3 lefties, and 3 switch hitters. It's not a hard, fast rule, but it does feel good to have a lineup that at least feels balanced. I'll have to make some hard choices the next time an awesome right-handed hitter comes out given I have Tulo, Pujols, and Cabrera, but that's a problem for a different day.
I will also always try to have a Giant in my starting lineup, and in my rotation. Right now, I'm running the Bryce Eldridge at first, along with Jackson Flora and Logan Webb in the rotation (and would use Ryan Walker in the bullpen, but screw him).
I also have a backup team to play with when I reach my goal for the ranked season or in the Weekend Classic. I have to use different players in the lineup than I do on my main squad (bonus points if they haven't gotten to Parallel 5 yet), and the pitchers have to be "Junk ballers." They have to have primary offspeed/breaking pitches or just feel like soft-tossing pitchers. Gaylord Perry is a total vibe fit, ya know? The team name is Antifa...stball (a shoutout to my rec-league slow pitch softball team), so we can't be throwing any outlier fastballs!
Sometimes we gotta make our own fun, or come up with our own rules. I do miss the events that had much more strict team-building rules from back in the day (even if meta cards still develop), so I gotta do it on my own!