Struggling with Poster Mockups / Poster sizes

Hey all! Ive created a huge batch of poster ready to upload but im really struggling with the mockups. Ive purchased some off etsy - using a tool called photopea which gives you basic photoshop features. Every time I upload the poster it requires me to crop some it off which is super annoying. Does anyone in here have a good process to mockups? Is photoshop worth investing in for this purpose?

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