Porduct marketing materials creation for 'non-marketer'

Hi, I'm solo in my SaaS journey and prefer to stay like that for now. I am in rather advanced phase of development of the app I wanted to start advertising. It's a specific niche (I don't even think that product hunt launch would make sense), but the people I target would appreciate to see the app in action. I am looking for tools (I would like to use once launched on ProductHunt if there are any, to support fellow soloprenours) to prepare short videos of how the product performs (the simpler the better, if AI powered even better). Apart from video, a nice to have would be to have a possibility of crating short (high resolution) gifs, I could use in my landing page. Any recommendation welcome, will check out all proposals. Cheers