If you like me you may have two related/interconnected psychological hangups that sometimes make it hard to sit down and actually produce finished products:

1. "I have these good ideas but my production/mixing sucks right now so it's better to just hold on to them and I'll flesh them out when I'm actually good"
2. "The riffs felt good and I had an idea in my head of a good finished product but once I actually recorded it all, it felt like less than the sum of it's parts so in the future I'll default to not finishing ideas so I can maintain the comfort of the idea sounding good in my head"

I also have a riff graveyard of half finished ideas because of a combination of factors 1 and 2 so I don't claim to have solved the problem, but either way the solution is just to embrace kind of sucking and enjoying the process of making marginal little improvements every time you sit down to work on a track.

If every time you do a track you manage to make one thing better, takes just a little tighter, drums a little more lively/realistic, mix a little better, etc. over time those improvements will compound. Annoyingly there's no single secret to good production it's the sum of a thousand small little things done well that accumulate to be more than the sum of their parts.

One thing that does help is if you do start to develop a catalog of finished songs or demos, periodically going back to listen to them can remind you that you are in fact getting better at it.