I've been using the Canon RF 50mm f/1.8 STM for a while now and I'm really satisfied with it. It works well and its super cheap. Quick question tho, are you shooting the party in a small room or outside? That lens can feel kinda zoomed in on an R50. TL;DR: The 50mm f/1.8 is the best budget way to get blurry backgrounds.

To add to the point above: I used the Canon RF 50mm f/1.8 STM for a party once. It's a decent option.

• 50mm: cheap, blurry
• Canon RF 35mm f/1.8 Macro IS STM: wider, expensive tho How big is the room?

Exactly what I was thinking

Building on the earlier suggestion, if youre looking for that pro look on a budget, youve really got two main paths to take with your R50.

• The Canon RF 50mm f/1.8 STM is the most straightforward pick. Its small, light, and the autofocus is snappy enough to catch a one year old moving around.
• Some people look at third party brands like TTArtisan or Meike to save cash, but most of those are manual focus only on the RF mount. Trust me, trying to manually focus on a toddler is a nightmare you dont want.
• Another route is getting a used Canon EF 50mm f/1.8 STM with an Canon Mount Adapter EF-EOS R. It works perfectly, but usually costs about the same as the RF version once you buy the adapter, so its kinda pointless unless you find a crazy deal. Basically, just stick to the native RF 50mm. It gives you that blurry background way better than any kit lens ever could, even if it feels a bit tight when youre shooting inside a small room... just gotta back up till you fit her in the frame.

Honestly, that kit lens you got is pretty disappointing if you want professional bokeh. It is just too slow and lacks the wide aperture needed to isolate a subject. I have had issues with kit glass being way too soft anyway. Since your budget is tight, you are basically stuck with one real choice. You should grab the Canon RF 50mm f/1.8 STM. It is usually around 170 bucks. It acts like an 80mm on your R50 because of the 1.6x crop factor, which is perfect for portraits. Unfortunately, Canon keeps their mount specs locked down so we dont have cheap third-party autofocus options from Sigma yet, which is a total bummer. Just make sure you use that f/1.8 setting to get the blurry background you are after. It will take some practice but you are gonna love the results compared to that basic kit lens.