Mouldking is one of the best when it comes to quality of the alternatives, I would say on the level of LEGO™. I'd suggest trying it out, they even sell on Amazon and are not that expensive.

I don't know if one gets brigaded here as well as on reddit, but if you actually want to have a good building experience, with better quality bricks and don't care about the sets as an investment, go to brick alternatives. Mouldking has a ton of cool star wars sets that are much cheaper per piece.

I stopped buying LEGO™ for years now, the alternatives only get better and LEGO™ only gets worse. The only reason to buy LEGO™ nowadays is to keep the sets closed and hope they get even more expensive in the future... They even stopped B-Models. They know their customers...