What do you guys do when you hit a brick wall?

So today I really feel like I am hitting a wall again..

I have started multiple projects / joined an early stage startup over the last years and never succeeded (basically never got any traction..). To be honest, I feel quite beat down by these experiences.

Time and again I feel like there is this flood of doubts that come up that cause me to give up / abandon the thing I am working on.

The doubts come in different forms:

• Everything I am working on has already been done and I can't figure out a way how I can be different
• Start thinking about completely different opportunities that are more "shiny"
• Traction is very low for the thing I am building

I do feel like I have progressed my skills as an entrepreneur / tech founder but I just feel a little lost how to push past these experiences and eventually build a real company.

Anyone else ever felt the same and / or can share some tips for solving this problem?