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Make it like this: to buy a new game, you have to finish one of your old ones.

If you can't get into a game after you've stayed away for a while, play some of the earlier parts to refresh your memory and make it easier on yourself. I find it helps a lot, and I almost always replay earlier missions/chapters/levels, especially the ones I really like, and mess around if applicable, before I've reached the end, even if I haven't played anything else in between.