Depending on how long you’ve been working on it and how hard you’ve marketed it, it’s important not to miss a signal that you should move on. While we all have problems with motivation from time to time, some things aren’t worth motivating yourself for and it’s important to recognise that. This might not apply if it’s just a hobby project - but a hobby project should probably be fun. If it’s a serious attempt at a business rethink your marketing strategy. Nothing will motivate you more than signups and revenue.