If you are ever at the point of having the time it takes to care for your animals affect your relationships with friends, family, romantic ones. You should take the time and money you'd spend on the next step and invest in those relationships instead.

Now that your friends and family know you aren't dead, ask them to watch your snakes while you use the next build's money on a field herping vacation tour (you'll see them posted every now and then on some sites)

There, you're poor again. No more snakes.

If you don't have friends, family or significant other or don't care about them I've found completely running out of room is the next step. If you keep your animals in tubs, instead of a new snake, pick a snake and put it in a nice vivarium. Do so with each urge.