First thing you need to understand, eBay limits the amount and value of the items you can LIST but there are no limits on much you can SELL.
Generally new sellers have low limits but these are usually automatically increased once you have made a number of transactions without problems.
You are not a new seller so none of the above should apply to you.
If you are using all of your current listing limits and want more you can request an increase every 30 days. follow the instructions on this page:
https://www.ebay.com/help/selling/listings/selling-limits?id=4107
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