How do you deal with this?
It sounds like you're not convincing anyone of the value of your proposals. You want to do something they've tried before, and presumably it failed. Why is it different this time around? Why are your ideas better? How will this align with the long term goals of the company?
Likewise, you want to make large changes to existing systems. Why aren't you able to convince them that this is the right way to spend your resources?
If you can't get people behind you you're going to have a hard time in your career. People are going to disagree with you all of the time. Learn how to sway them to your side. It may make sense to you, but for whatever reason, it doesn't to them. So what are they looking for? What are their concerns? What might they know that you do not, or what do you know that they don't?
Ask them questions. Why didn't this work the last time around? What is our mandate as an engineering organization? What issues do you foresee in doing this? They may make your point for you in their answers, or you may realize that your idea isn't fully fledged.
Sometimes timing has to be right too. If the team is swamped with work and your idea is a variation of something that didn't work in the past (even if you think it'll work this time), maybe it's better to save it for later. But if it had a direct impact on the drowning, double down on it. Collect more data, convince more people, etc.