Ted Lasso

Parks and Recreation!

Schitt's Creek

Try Better Off Ted. It only ran for a season and a half but it was funny.

Taskmaster

Would I Lie to You?

Avatar The Last Airbender

Loremen podcast

Edited to add:

One Punch Man first season is hilarious.

The trifecta of 2010s animation: Regular Show, Steven Universe, and Adventure Time. There's jokes and themes in these that are pretty adult, but the darker stuff is generally avoided.

1980s: Dogtanian and the 3 Muskehounds. Mysterious Cities of Gold. Best theme tunes ever, and very easy watching.

Psych

My Name Is Earl is my favorite go-to light-hearted and positive sitcom. Follows the story of a rather silly, ignorant redneck that begins to believe in karma, and so writes a list everyone he has ever wronged and goes about fixing it one by one.

It's pretty good.

Bluey pretends to be for kids but it's surely for adults.

I highly recommend Bob's burgers!

Star Trek: Lower Decks

Good Omens.

I love sitcoms but beneath their light exterior they always have a heart of darkness, or at least a trace of one. But given your OP, I figure you can handle a teensy bit of a shadow side. Here are some generally upbeat shows with lots of laughs.

Catastrophe- I think it strikes the right balance of optimism in the face of doubt. It's light but not saccharine. It's my favorite sitcom.

It Crowd

Black Books

30 Rock

Black-ish

Adventure Time

Mentioned in lots of other replies:

Parks and Rec

New Girl (extremely underrated)

Unbreakable Kimmy Schmidt

Brooklyn 99

Taskmaster

WILTY

Bob's Burgers.

Schitt's Creek (was already mentioned but is worth mentioning again

Brooklyn Nine-Nine

Superstore

Derry Girls

Wellmania (sadly Netflix did a Netflix and discontinued another great show after only one season)

Or just rewatch The Office or Parks & Recreation once again 😄

Ted Lasso for the win

Community! If you like The Good Place you'll love it. It's my favorite show of all time

Dirk Gently's Holistic Detective Agency

Letterkenny!

Star Trek the next generation

Brooklyn nine nine

One piece

Scrubs

New Girl

Detectorists

Our Flag Means Death is upbeat in the first season. The second is more dramatic, but also fucking phenomenal. A romantic adventure comedy becomes a romantic adventure dramedy.

Ted Lasso, can't recommend it enough.

Here's a weird suggestion, watch all Mr. Bean shows. It's like one season and few episodes.

I love "the good place". It's light comedy, it actually makes you think a little, it's a lot of feel good and it's one of those shows where you can see that everyone is having a blast making it.

Edit: I should finish reading the post before commenting, lol.

Agree about Parks & Rec and Black Books

Adding Boston Legal

Unbreakable Kimmy Schmidt

British panel (game) shows like Would I Lie to You and 8 out or 10 Cats Does Countdown. The game element is just an excuse for funny, interesting people to crack jokes and have a good time.

If you love "the good place", then I can only recommend "parks and recreation". That is my all-time favorite show

Also recently I have started watching "Chuck". It's a action/comedy/spy series, there is ofcource action, guns and bombs. But Iam laughing so much each episode, I find myself rewatching some scenes.

Letterkenny and Shorsey if not Archer. Trailer Park boys

Pushing Daisies. If you like death mixed with comic book sweetness

Happy Endings

Cougar Town

Community

Derry Girls

Parks and Rec

I don't think there is a more light-hearted show than Detectorists

The Venture Brothers is hilarious.

Kim's Convenience on Netflix.

Eureka is kind of a disaster of the week pseudoscience problem show with a lot of heart. Don't go looking for true scifi, but it's so damn charming and the cast has exceptional chemistry.

Not adult, but The Owl House was a surprisingly good one. One of those multi-audience shows. Makes me think a lot of about the type of parent I want to be someday!

Scrubs in addition to a bunch of the great suggestions in here.

Schitt’s Creek and Letterkenny deserve some spots here

Close Enough is a really great animated tv show by the creator of Regular Show. It's basically almost the same, but for adults.

Also, Workaholics

Joe Pera Talks To You

Going for the more obscure: Bajillion Dollar Properties. Originally made for a dead streaming service, now exists on PlutoTV for free (and can be purchased through Apple et al). It's a satire of real estate reality shows with phenomenal guest stars throughout. Main cast includes a few folks before they got their bigger roles (like Tawny Newsome, Drew Tarver, and Eugene Cordero) but also includes the GOAT, Paul F. Tompkins.

Very related, I would also suggest the Comedy Bang! Bang! TV show that ran for 5 seasons on IFC. It's a treasure trove of comedic goodness, lots of great guests, and who doesn't love Reggie Watts, Kid Cudi, then Weird Al as the band leaders??