Renters and homeowners won’t cover you. They’ll tell you that you need a special rider policy like what is done for jewelry, but their underwriters won’t touch it. You can look into collectible specific insurers but they are not worth your time or the cumulative expense. The quotes are ridiculously priced and good luck ever getting them to pay out a claim for true value. They’ll do what insurance does and find a way to deny the claim or underpay the claim.
You’re better off a) not advertising what you have on any social media because you paint a target on your back; b) being careful about who you show your collection to physically (and never disclose the value) because most times someone is robbed it’s by someone they know or someone with access to the home and knows your routines; c) buying a quality safe, making sure it is secured to the floor and fireproof, and it is hidden; and d) install a basic alarm system as a deterrent and also buy some cameras that can at least serve as evidence to help the police catch the thief and recover your items. Your collection will be more secure this way than insurance. My two cents.