Well i am not exactly a game dev , but ive dabbled in quite a few clicker/idle games and one of the most important thing to get is certain milestones or achievments. The most easy way of doing it is to reward you if you get certain numbers , for example why would i need to spend more money on the first item if item 3 or 4 is cheaper and gives me sugnificantly more boost ? One way to do that is to have milestone multipliers , like for example if you buy a certain amount you get it upgraded to do more. Or the other thing is you can introduce upgrades to your mechanics .
Thanks for the idea! I will definitely add that some time in the future when i put out an update, but right now im kinda bored of developing it because its just a huge project already which even i cant navigate that well, i was thinking of porting it to unity but im just too lazy. But i will remember this idea! Thank you!