Question about converting coins from a noob

Hi all, sorry if this is annoying but I was hoping someone could advise.

I’ve been experimenting with different coins in the past and, as a result, there’s a few coins i no longer want to hold.

I thought the most straightforward way of settling this was to simply covert into other coins that grabbed my attention. However, whenever I decide to convert, it’s not allowed.

For example, I’ve got 633 doge that I bought ages ago For fun and I cannot covert them because “minimum 1000 to convert”. Can’t convert my VET because I am only shown the option to convert to LINK (I don’t own any of those so not sure why this is the only default option).

Is there a reason for this or am I just unlucky? I would be very grateful if someone could shed some light.

Any advice would be highly appreciated.

Thank you in advance.