Sorry to hear about your bad luck with keeping plants. Keep in mind, a lot of plants sold at big box stores aren't true aquatic plants and will slowly rot and die if grown submerged.
Are you thinking of trying again and looking for advice? If you advise us of your specs we might be able to offer some potential solutions or advice.
Nonetheless, any hobby has a learning curve so don't give up. I've killed plenty of plants - glosso being the latest victim.