Teletext.io alternatives

I bought into Agile Assets via the AppSumo Lifetime deal for the "Cosmopolitan Plan". The integrations work well, however the service is virtually unusable for my use case - which is social media post management and scheduling. The website is an eyestrain and is usable only after replacing the custom fonts and removing significant (stylistic?) chunks - which can be done with uBlock Origin, but this should not be required. The integrations function - in that you can connect social accounts and schedule posts. This was very simple and straightforward to set up with every social channel I needed to access. There are no real fixed limits except on the AI token. You can make as many workspace calendars as you need. But this is pretty much where the good news ends. The posts scheduler is cumbersome and feels terrible to use. When adding content, particularly in bulk, the facilities are lacking and unclear. The bulk upload is only XLS, there is no CSV, and then you have only three data columns to work with, including "media" which is an image file pasted on top of the xls spreadsheet. You do not have the ability to schedule the post times inside the bulk upload, for example. I did not use the Canva integration. Nor did I use their AI tool. My use case is for a social media scheduler, which I did not find this tool fit for use and found a better fit alternative.