Interest Stacks

Made by the same author as Konosuba, Natsume Akatsuki, which was made before he created Konosuba, it has many of the elements of Combatants Will Be Despatched and was later implemented into Konosuba.
If you're want to know where his inspiration and ideas came from, then I suggest to start watching it.

Cautious Hero has many similarities to Konosuba, the main characters gets isekai'd and meets a useless goddess. Both Seiya and Kazuma share the same trait and personality, to a certain extent, and whenever there in a fight nothing goes planned.
For a short description it's pretty much the same thing except kazuma would be op, so if you're interested give it a watch.

Princess Connect is originally based on a gacha game that had a anime adaption, now most gacha game adaptions aren't really that interesting, they're only there to promote the game and get as many players as possible, but what Princess Connect does differently is that it adds personality to the characters, instead of a cardboard box. The main cast is similar to the konosuba cast with different characteristics amongst them. It also has really good animation when it gets serious just like konosuba, and many of the character's expressions are identically the same to konosuba.
If you like the chaotic cast of konosuba then you will definitely enjoy this one.

While this may not be as good as the others I mentioned, I still think it's worth a watch. Full dive is the only one here that is not an isekai, but it still shares some similarities, Yuuki Hiroshi the main character is a loser all through out, until he stumbled on a virtual reality game called Kiwame Quest which is said to be the world's worst game. Much like Kazuma, Hiroshi always ends up in bad situations. Like Kazuma's party, Hiroshi and he's party of friends are unique and quirky, and have always caused trouble for him.

Ixion Saga DT is a anime I'll never forget, not because its the best comedy or has the best plotline but because it's super unappreciated. I feel like I'm the only one who watched this anime because no one ever talks about it. People say that Konosuba is the first anime to have a comedic twist to the isekai genre, but I disagree. Ixion Saga DT came out way before konosuba was even created, yet it's still not getting enough attention it deserves. The main characters are both shut in gamers who are pervy, and always try to cheat their way into fights. Many of the other cast members have their own gimmicks that differentiate between different characters.
If you loved konosuba then I'll highly, highly suggest you give this anime a shot, even if it didn't meet your expectation, I'll still at least appreciate you for giving it a watch.