Last year Spotify partnered up with a Merchbar service. Basically, Merchbar shows your merch stuff on Spotify. For example, you have merch on your Bandcamp, you can fill out a form, get approved and start selling right from Spotify. Merchbar will take a commission.
It looks like they are not accepting everyone at the moment, but it’s worth a try because your Spotify profile looks next level and of course more chances to sell the merch.
As an example, check Metallica’s Spotify and you’ll find a couple of merch items there. I’ll add a link to Merchbar for Artists in my bio, you’ll find a sign-up form there.